Harnessing the Power of Cold Exposure: A Path to Enhanced Resilience and Longevity
Deliberate cold exposure is a protocol for training your nervous system — not just tolerating discomfort, but converting it into durable resilience, elevated dopamine, and a faster metabolism.
Video·Brain Mindset·11 min read·June 2026
A neuroscientist's framework for using deliberate cold exposure to build resilience, elevate dopamine, accelerate metabolism, and sharpen physical performance.
The Deliberate Difference
Not all cold is equal, and the distinction begins with intention. Stepping into cold water on purpose — with awareness, with a specific outcome in mind — produces a different physiological response than being caught off guard by the same temperature. When you choose the cold, your nervous system registers that choice. The adaptations that follow are shaped by the deliberate nature of that act. Intentionality is not a peripheral concept here; it is the mechanism that separates a training stimulus from an incidental one.
I would really like to get out of this environment but I can stay in safely
Calibrating your exposure starts with a straightforward internal rule: the environment you enter should produce a genuine, immediate desire to leave — while remaining within the bounds of safe endurance. That edge — uncomfortable but sustainable — is the target temperature for every session. Cold tolerance varies too widely across individuals for any universal prescription. Body composition, metabolic rate, acclimatization history, and other deeply personal factors all shape what cold enough means for you. Use your body's own signal as the benchmark, and recalibrate as your capacity grows.
The format you choose shapes the depth of the stimulus. Full submersion to the neck — with hands and feet submerged in cold water — produces the most powerful and comprehensive response and carries the highest carry-over to the neurochemical and metabolic benefits that follow. Cold showers represent the next tier: practical, widely accessible, and effective when applied with genuine focus. Outdoor exposure in minimal clothing, brought to the threshold of shivering, is the most approachable entry point into the practice. Each format carries real value; each has a ceiling.
Temperature is among the most reliable and potent stimuli the human body can receive — and that potency comes with genuine hazards if it is misapplied. Cold water extracts heat from the body far faster than cold air, and the distance between effective stimulus and serious danger is narrower than intuition suggests. Hypothermia, cardiovascular stress, and sudden loss of coordination in open water are real risks, not hypothetical ones. Every protocol worth following treats these hazards not as reasons to avoid the practice but as reasons to approach it with precision.
This is why the word deliberate carries so much weight. Accidental cold bypasses the mental engagement that makes the practice meaningful. When you choose the cold — when you step into discomfort as a conscious act of will rather than a circumstance you endure — you activate a fundamentally different relationship with the stimulus. That choice, repeated across sessions and weeks, is what converts a stress response into a tool, and a tool into a durable capacity for resilience, adaptability, and physical performance.
deliberate cold exposure has a very deliberate cold exposure has a very powerful effect on the release of powerful effect on the release of powerful effect on the release of dopamine in our brain and body there are dopamine in our brain and body there are dopamine in our brain and body there are a couple of mechanisms by which one a couple of mechanisms by which one a couple of mechanisms by which one might experience increases in might experience increases in might experience increases in testosterone as a consequence of testosterone as a consequence of testosterone as a consequence of deliberate cold exposure Brown fat can deliberate cold exposure Brown fat can deliberate cold exposure Brown fat can increase your overall core metabolism in increase your overall core metabolism in increase your overall core metabolism in other words the number of calories that other words the number of calories that other words the number of calories that you burn per day temperature is a very you burn per day temperature is a very you burn per day temperature is a very potent stimulus for the brain and body potent stimulus for the brain and body potent stimulus for the brain and body that also means that it carries certain that also means that it carries certain that also means that it carries certain hazards if it's not done correctly it's hazards if it's not done correctly it's hazards if it's not done correctly it's key to point out the word deliberate key to point out the word deliberate key to point out the word deliberate if I don't say otherwise then throughout if I don't say otherwise then throughout if I don't say otherwise then throughout this episode if I say cold exposure I this episode if I say cold exposure I this episode if I say cold exposure I mean deliberate cold exposure there are mean deliberate cold exposure there are mean deliberate cold exposure there are important effects of what we call important effects of what we call important effects of what we call mindset if we are doing something mindset if we are doing something mindset if we are doing something deliberately and we believe that it's deliberately and we believe that it's deliberately and we believe that it's going to be good for us it actually can going to be good for us it actually can going to be good for us it actually can lead to a different set of physiological lead to a different set of physiological lead to a different set of physiological effects than if something is happening effects than if something is happening effects than if something is happening to us against our will or without our to us against our will or without our to us against our will or without our control meaning that you are placing control meaning that you are placing control meaning that you are placing yourself into a cold environment on yourself into a cold environment on yourself into a cold environment on purpose in order to extract a particular
purpose in order to extract a particular purpose in order to extract a particular set of benefits and one of the most set of benefits and one of the most set of benefits and one of the most common questions I get when discussing common questions I get when discussing common questions I get when discussing the use of cold for sake of mental or the use of cold for sake of mental or the use of cold for sake of mental or physical performance metabolism Etc is physical performance metabolism Etc is physical performance metabolism Etc is how cold should it be how cold depends how cold should it be how cold depends how cold should it be how cold depends on your cold tolerance your core on your cold tolerance your core on your cold tolerance your core metabolism and a number of other metabolism and a number of other metabolism and a number of other features that there is simply no way I features that there is simply no way I features that there is simply no way I could know or have access to could know or have access to could know or have access to so I would like you to use this rule of so I would like you to use this rule of so I would like you to use this rule of thumb thumb thumb if you are using deliberate cold if you are using deliberate cold if you are using deliberate cold exposure exposure exposure the environment that you place yourself the environment that you place yourself the environment that you place yourself into should place your mind into a state into should place your mind into a state into should place your mind into a state of whoa I would really like to get out of whoa I would really like to get out of whoa I would really like to get out of this environment but I can stay in of this environment but I can stay in of this environment but I can stay in safely safely safely the second most common question I get the second most common question I get the second most common question I get about deliberate cold exposure is about deliberate cold exposure is about deliberate cold exposure is whether or not cold showers are as good whether or not cold showers are as good whether or not cold showers are as good better or worse than cold water better or worse than cold water better or worse than cold water immersion up to the neck pulled water immersion up to the neck pulled water immersion up to the neck pulled water immersion up to the neck with your feet immersion up to the neck with your feet immersion up to the neck with your feet and hands submerged also is going to be and hands submerged also is going to be and hands submerged also is going to be the most effective the most effective the most effective second best would be cold shower
second best would be cold shower second best would be cold shower third best would be to go outside with a third best would be to go outside with a third best would be to go outside with a minimum amount of clothing but of course minimum amount of clothing but of course minimum amount of clothing but of course clothing that is culturally appropriate clothing that is culturally appropriate clothing that is culturally appropriate and that would allow you to experience and that would allow you to experience and that would allow you to experience cold to the point where you would almost cold to the point where you would almost cold to the point where you would almost want to shiver or start shivering so want to shiver or start shivering so want to shiver or start shivering so let's talk about protocols for enhancing let's talk about protocols for enhancing let's talk about protocols for enhancing mental health and performance using mental health and performance using mental health and performance using deliberate cold exposure deliberate cold exposure deliberate cold exposure what happens when we get into cold is what happens when we get into cold is what happens when we get into cold is that we experience an increase in that we experience an increase in that we experience an increase in norepinephrine in noradrenaline release norepinephrine in noradrenaline release norepinephrine in noradrenaline release and an adrenaline release the fact that and an adrenaline release the fact that and an adrenaline release the fact that cold exposure deliberate or no cold exposure deliberate or no cold exposure deliberate or no increases norepinephrine and epinephrine increases norepinephrine and epinephrine increases norepinephrine and epinephrine in our brain and body means that it is a in our brain and body means that it is a in our brain and body means that it is a very reliable stimulus for increasing very reliable stimulus for increasing very reliable stimulus for increasing norepinephrine and epinephrine that's norepinephrine and epinephrine that's norepinephrine and epinephrine that's sort of an obvious statement but that sort of an obvious statement but that sort of an obvious statement but that obvious statement can be leveraged to obvious statement can be leveraged to obvious statement can be leveraged to systematically build up what we call systematically build up what we call systematically build up what we call resilience now when we experience a resilience now when we experience a resilience now when we experience a stressor in life whether or not it's stressor in life whether or not it's stressor in life whether or not it's something bad happens in our something bad happens in our something bad happens in our relationship or something bad happens in
relationship or something bad happens in relationship or something bad happens in the world and we feel stress the world and we feel stress the world and we feel stress that stresses the consequence of that stresses the consequence of that stresses the consequence of increases in norepinephrine and increases in norepinephrine and increases in norepinephrine and epinephrine in our brain and body very epinephrine in our brain and body very epinephrine in our brain and body very similar if not identical to the kinds of similar if not identical to the kinds of similar if not identical to the kinds of increases that come from deliberate cold increases that come from deliberate cold increases that come from deliberate cold exposure so deliberate cold exposure is exposure so deliberate cold exposure is exposure so deliberate cold exposure is an opportunity to deliberately stress an opportunity to deliberately stress an opportunity to deliberately stress our body and yet because it's deliberate our body and yet because it's deliberate our body and yet because it's deliberate and because we can take certain steps and because we can take certain steps and because we can take certain steps which I'll describe in a moment which I'll describe in a moment which I'll describe in a moment we can learn to maintain mental clarity we can learn to maintain mental clarity we can learn to maintain mental clarity we can learn to maintain calm while our we can learn to maintain calm while our we can learn to maintain calm while our body is in a state of stress and that body is in a state of stress and that body is in a state of stress and that can be immensely useful when can be immensely useful when can be immensely useful when encountering stressors in other parts of encountering stressors in other parts of encountering stressors in other parts of life and that's what we call resilience life and that's what we call resilience life and that's what we call resilience or grit our ability or mental toughness or grit our ability or mental toughness or grit our ability or mental toughness our ability to lean into challenge or to our ability to lean into challenge or to our ability to lean into challenge or to tolerate challenge while keeping our tolerate challenge while keeping our tolerate challenge while keeping our heads straight so to speak so one simple heads straight so to speak so one simple heads straight so to speak so one simple protocol for increasing resilience is to protocol for increasing resilience is to protocol for increasing resilience is to pick a temperature that's uncomfortable pick a temperature that's uncomfortable pick a temperature that's uncomfortable of shower or cold immersion
of shower or cold immersion of shower or cold immersion and then to get in for a certain and then to get in for a certain and then to get in for a certain duration of time and then to get out so duration of time and then to get out so duration of time and then to get out so the way to think about norepinephrine the way to think about norepinephrine the way to think about norepinephrine and epinephrine in this context of and epinephrine in this context of and epinephrine in this context of building mental resilience is that you building mental resilience is that you building mental resilience is that you have two options you can either try to have two options you can either try to have two options you can either try to extend the duration of time that you are extend the duration of time that you are extend the duration of time that you are in the deliberate cold exposure so going in the deliberate cold exposure so going in the deliberate cold exposure so going from one minute to 75 seconds to two from one minute to 75 seconds to two from one minute to 75 seconds to two minutes and so on over a period of days minutes and so on over a period of days minutes and so on over a period of days or one way to approach this and the way or one way to approach this and the way or one way to approach this and the way that I particularly favor is to take the that I particularly favor is to take the that I particularly favor is to take the context of the day and the moment into context of the day and the moment into context of the day and the moment into account and start to be able to sense account and start to be able to sense account and start to be able to sense the release of epinephrine epinephrine the release of epinephrine epinephrine the release of epinephrine epinephrine excuse me and norepinephrine in our excuse me and norepinephrine in our excuse me and norepinephrine in our brain and body and see those as walls brain and body and see those as walls brain and body and see those as walls that we want to climb over in order to that we want to climb over in order to that we want to climb over in order to build resilience and to start counting build resilience and to start counting build resilience and to start counting the number of Walls that we Traverse and the number of Walls that we Traverse and the number of Walls that we Traverse and the distance between those walls as we the distance between those walls as we the distance between those walls as we do deliberate cold exposure okay the do deliberate cold exposure okay the do deliberate cold exposure okay the next question that I always get is what next question that I always get is what next question that I always get is what should my mental state be while I'm should my mental state be while I'm should my mental state be while I'm exposing myself to this uncomfortable
exposing myself to this uncomfortable exposing myself to this uncomfortable yet safe condition of cold well you have yet safe condition of cold well you have yet safe condition of cold well you have two options and there are probably other two options and there are probably other two options and there are probably other options as well one is to try and calm options as well one is to try and calm options as well one is to try and calm yourself to remain as mentally still as yourself to remain as mentally still as yourself to remain as mentally still as possible possible possible the other is to lean into that challenge the other is to lean into that challenge the other is to lean into that challenge and so to grind it out sometimes it's and so to grind it out sometimes it's and so to grind it out sometimes it's easier to calm yourself one way to do easier to calm yourself one way to do easier to calm yourself one way to do that is through double inhales through that is through double inhales through that is through double inhales through the nose and extended exhales through the nose and extended exhales through the nose and extended exhales through the mouth or simply by trying to control the mouth or simply by trying to control the mouth or simply by trying to control your breathing and reduce the pace of your breathing and reduce the pace of your breathing and reduce the pace of your breathing and increase the volume your breathing and increase the volume your breathing and increase the volume of your breathing another very common of your breathing another very common of your breathing another very common question is how often to do deliberate question is how often to do deliberate question is how often to do deliberate cold exposure cold exposure cold exposure tough to make a recommendation on that tough to make a recommendation on that tough to make a recommendation on that based on any peer-reviewed study based on any peer-reviewed study based on any peer-reviewed study although there are a few Inhumans that although there are a few Inhumans that although there are a few Inhumans that point to a threshold of 11 minutes total point to a threshold of 11 minutes total point to a threshold of 11 minutes total per week so that's total throughout the per week so that's total throughout the per week so that's total throughout the week divided into two or four sessions week divided into two or four sessions week divided into two or four sessions of two or three minutes or so deliberate of two or three minutes or so deliberate of two or three minutes or so deliberate cold exposure has a very powerful effect cold exposure has a very powerful effect cold exposure has a very powerful effect on the release of dopamine in our brain on the release of dopamine in our brain on the release of dopamine in our brain and body and this is one of the main
and body and this is one of the main and body and this is one of the main reasons why people continue to do reasons why people continue to do reasons why people continue to do deliberate cold exposure deliberate cold exposure basically it makes us feel good and it basically it makes us feel good and it basically it makes us feel good and it continues to make us feel good even continues to make us feel good even continues to make us feel good even after we get out of the cold environment after we get out of the cold environment after we get out of the cold environment in fact some people would say they don't in fact some people would say they don't in fact some people would say they don't feel good in the cold environment it's feel good in the cold environment it's feel good in the cold environment it's all stress for them but afterwards they all stress for them but afterwards they all stress for them but afterwards they feel great almost everybody who does feel great almost everybody who does feel great almost everybody who does deliberate cold exposure will say yeah deliberate cold exposure will say yeah deliberate cold exposure will say yeah it was stressful I didn't enjoy it or I it was stressful I didn't enjoy it or I it was stressful I didn't enjoy it or I eventually grew to like it but that I eventually grew to like it but that I eventually grew to like it but that I always feel better afterwards and then always feel better afterwards and then always feel better afterwards and then that feeling lasts a very long period of that feeling lasts a very long period of that feeling lasts a very long period of time and I think it's almost certain time and I think it's almost certain time and I think it's almost certain that those experiences that people that those experiences that people that those experiences that people report relate to these increases in report relate to these increases in report relate to these increases in dopamine and in concert with the dopamine and in concert with the dopamine and in concert with the increases in norepinephrine also explain increases in norepinephrine also explain increases in norepinephrine also explain the other effect that's commonly the other effect that's commonly the other effect that's commonly reported which is an enhancement in reported which is an enhancement in reported which is an enhancement in mental acuity and the ability to focus mental acuity and the ability to focus mental acuity and the ability to focus now I'd like to shift our attention to now I'd like to shift our attention to now I'd like to shift our attention to the effects of deliberate cold exposure the effects of deliberate cold exposure the effects of deliberate cold exposure on metabolism deliberate cold exposure on metabolism deliberate cold exposure on metabolism deliberate cold exposure converts converts converts one particular kind of fat cell the one particular kind of fat cell the one particular kind of fat cell the white fat cell which is a very low
white fat cell which is a very low white fat cell which is a very low metabolic output cell it's basically a metabolic output cell it's basically a metabolic output cell it's basically a storage site for energy in the body fat storage site for energy in the body fat storage site for energy in the body fat cells to a different type of fat cell cells to a different type of fat cell cells to a different type of fat cell which is the beige fat cell called beige which is the beige fat cell called beige which is the beige fat cell called beige because it's actually beige or slightly because it's actually beige or slightly because it's actually beige or slightly Brown under the microscope or even to Brown under the microscope or even to Brown under the microscope or even to Brown fat cells which are very dark Brown fat cells which are very dark Brown fat cells which are very dark under the microscope and dark because under the microscope and dark because under the microscope and dark because they contain mitochondria they contain mitochondria they contain mitochondria and are very metabolically and and are very metabolically and and are very metabolically and thermogenically active so beige fat and thermogenically active so beige fat and thermogenically active so beige fat and brown fat brown fat brown fat is very good at raising our metabolism is very good at raising our metabolism is very good at raising our metabolism and helps burn white fat now of course and helps burn white fat now of course and helps burn white fat now of course it does that only in the context of a it does that only in the context of a it does that only in the context of a caloric deficit but it can actually help caloric deficit but it can actually help caloric deficit but it can actually help create that caloric deficit having more create that caloric deficit having more create that caloric deficit having more beige fat and brown fat can increase beige fat and brown fat can increase beige fat and brown fat can increase your overall core metabolism in other your overall core metabolism in other your overall core metabolism in other words the number of calories that you words the number of calories that you words the number of calories that you burn per day and therefore the number of burn per day and therefore the number of burn per day and therefore the number of calories that you need to either calories that you need to either calories that you need to either maintain or to lose weight should you maintain or to lose weight should you maintain or to lose weight should you get into the heat afterward or before or
get into the heat afterward or before or get into the heat afterward or before or not at all and this is where we can not at all and this is where we can not at all and this is where we can point to the so-called soberg principle point to the so-called soberg principle point to the so-called soberg principle to achieve the greatest increases in to achieve the greatest increases in to achieve the greatest increases in metabolism metabolism metabolism through deliberate cold exposure through deliberate cold exposure through deliberate cold exposure you want to force yourself to reheat on you want to force yourself to reheat on you want to force yourself to reheat on your own after the deliberate cold your own after the deliberate cold your own after the deliberate cold exposure meaning you wouldn't want to go exposure meaning you wouldn't want to go exposure meaning you wouldn't want to go from the cold shower to a hot shower or from the cold shower to a hot shower or from the cold shower to a hot shower or from the cold shower to a sauna rather from the cold shower to a sauna rather from the cold shower to a sauna rather if you were going to start with a hot if you were going to start with a hot if you were going to start with a hot shower or you're going to start with a shower or you're going to start with a shower or you're going to start with a sauna that you would end with the cold sauna that you would end with the cold sauna that you would end with the cold and then you would reheat naturally and then you would reheat naturally and then you would reheat naturally deliberate cold exposure deliberate cold exposure that evokes shivering from the muscles that evokes shivering from the muscles that evokes shivering from the muscles causes the release of a molecule called causes the release of a molecule called causes the release of a molecule called succinate from the muscles and that succinate from the muscles and that succinate from the muscles and that succinate plays a key role in activating succinate plays a key role in activating succinate plays a key role in activating Brown fat thermogenesis which you now Brown fat thermogenesis which you now Brown fat thermogenesis which you now have heard about and understand as have heard about and understand as have heard about and understand as critical to the increases in metabolism critical to the increases in metabolism critical to the increases in metabolism caused by deliberate cold exposure so caused by deliberate cold exposure so caused by deliberate cold exposure so what this means is if you want to what this means is if you want to what this means is if you want to increase your metabolism end on cold increase your metabolism end on cold increase your metabolism end on cold that's the sober principle and as best
that's the sober principle and as best that's the sober principle and as best you can try and get to the point where you can try and get to the point where you can try and get to the point where you are shivering either when you are in you are shivering either when you are in you are shivering either when you are in the cold exposure or immediately the cold exposure or immediately the cold exposure or immediately afterwards now I'd like to shift our afterwards now I'd like to shift our afterwards now I'd like to shift our attention to the use of deliberate cold attention to the use of deliberate cold attention to the use of deliberate cold exposure for sake of physical exposure for sake of physical exposure for sake of physical performance your main goal is performance your main goal is performance your main goal is hypertrophy and strength it is probably hypertrophy and strength it is probably hypertrophy and strength it is probably best to avoid cold water immersion and best to avoid cold water immersion and best to avoid cold water immersion and ice bath immersion in the four hours ice bath immersion in the four hours ice bath immersion in the four hours immediately following that strength and immediately following that strength and immediately following that strength and or hypertrophy training now there are or hypertrophy training now there are or hypertrophy training now there are nice data pointing to the fact that nice data pointing to the fact that nice data pointing to the fact that doing cold water immersion after a hard doing cold water immersion after a hard doing cold water immersion after a hard run so endurance training or even Sprint run so endurance training or even Sprint run so endurance training or even Sprint and interval training or after a Weight and interval training or after a Weight and interval training or after a Weight Workout where your main focus is on Workout where your main focus is on Workout where your main focus is on performance of those movements or after performance of those movements or after performance of those movements or after a skill training workout where your main a skill training workout where your main a skill training workout where your main focus on performance of those movements focus on performance of those movements focus on performance of those movements that there's no reason to think that that there's no reason to think that that there's no reason to think that that cold water immersion or ice bath or that cold water immersion or ice bath or that cold water immersion or ice bath or cold shower would inhibit the progress cold shower would inhibit the progress cold shower would inhibit the progress or the stimulus that would lead to
or the stimulus that would lead to or the stimulus that would lead to progress that occurred during that progress that occurred during that progress that occurred during that training session training session training session if you are somebody who experiences a if you are somebody who experiences a if you are somebody who experiences a lot of delayed onset muscle soreness lot of delayed onset muscle soreness lot of delayed onset muscle soreness taking a cold shower after your training taking a cold shower after your training taking a cold shower after your training or getting into a cold immersion after or getting into a cold immersion after or getting into a cold immersion after your training even if it's a few hours your training even if it's a few hours your training even if it's a few hours later later later ought to help and if you are doing ought to help and if you are doing ought to help and if you are doing particularly intense training then you particularly intense training then you particularly intense training then you probably want to ratchet up the number probably want to ratchet up the number probably want to ratchet up the number of cold exposure sessions that you're of cold exposure sessions that you're of cold exposure sessions that you're doing even if those have to be done on doing even if those have to be done on doing even if those have to be done on separate days from your training because separate days from your training because separate days from your training because a lot of the inflammatory effects of a lot of the inflammatory effects of a lot of the inflammatory effects of training endurance and strength training training endurance and strength training training endurance and strength training are actually occurring some hours away are actually occurring some hours away are actually occurring some hours away from the training stimulus so it's not from the training stimulus so it's not from the training stimulus so it's not just that inflammation goes up radically just that inflammation goes up radically just that inflammation goes up radically during training which it often can but during training which it often can but during training which it often can but that it can occur even in the days and that it can occur even in the days and that it can occur even in the days and even weeks afterwards depending on how even weeks afterwards depending on how even weeks afterwards depending on how intense and how long duration that intense and how long duration that intense and how long duration that training is so delivery cold exposure is training is so delivery cold exposure is training is so delivery cold exposure is very powerful as an anti-inflammatory very powerful as an anti-inflammatory very powerful as an anti-inflammatory tool a final topic related to the use of tool a final topic related to the use of tool a final topic related to the use of deliberate cold exposure for improving deliberate cold exposure for improving deliberate cold exposure for improving health and performance using deliberate health and performance using deliberate health and performance using deliberate cold exposure to the groin in particular cold exposure to the groin in particular cold exposure to the groin in particular to the testicles in order to try and
to the testicles in order to try and to the testicles in order to try and increase testosterone there are a couple increase testosterone there are a couple increase testosterone there are a couple of mechanisms by which one might of mechanisms by which one might of mechanisms by which one might experience increases in testosterone as experience increases in testosterone as experience increases in testosterone as a consequence of deliberate cold a consequence of deliberate cold a consequence of deliberate cold exposure the first is somewhat direct exposure the first is somewhat direct exposure the first is somewhat direct which is that anytime you cool a body which is that anytime you cool a body which is that anytime you cool a body surface that if it's cold enough you're surface that if it's cold enough you're surface that if it's cold enough you're going to get vasoconstriction and then going to get vasoconstriction and then going to get vasoconstriction and then subsequently you're going to get a subsequently you're going to get a subsequently you're going to get a rebound increase in vasodilation meaning rebound increase in vasodilation meaning rebound increase in vasodilation meaning you're going to constrict the blood you're going to constrict the blood you're going to constrict the blood vessels in that area and then after the vessels in that area and then after the vessels in that area and then after the cold is removed there's going to be more cold is removed there's going to be more cold is removed there's going to be more blood flow to that area and of course blood flow to that area and of course blood flow to that area and of course blood flow relates to organ health and blood flow relates to organ health and blood flow relates to organ health and tissue Health generally so perfusion of tissue Health generally so perfusion of tissue Health generally so perfusion of that region and those and the gonads to that region and those and the gonads to that region and those and the gonads to be specific with additional blood you be specific with additional blood you be specific with additional blood you could imagine in some ways increasing could imagine in some ways increasing could imagine in some ways increasing testosterone the other probably more testosterone the other probably more testosterone the other probably more likely mechanism relates to the dopamine likely mechanism relates to the dopamine likely mechanism relates to the dopamine increases caused by cold exposure that increases caused by cold exposure that increases caused by cold exposure that we talked about earlier again anytime we talked about earlier again anytime we talked about earlier again anytime you have a somewhat stressful stimulus you have a somewhat stressful stimulus you have a somewhat stressful stimulus but in particular with cold exposure it but in particular with cold exposure it but in particular with cold exposure it seems that the catecholamines seems that the catecholamines seems that the catecholamines norepinephrine epinephrine and dopamine
norepinephrine epinephrine and dopamine norepinephrine epinephrine and dopamine all increase and dope dopamine is known all increase and dope dopamine is known all increase and dope dopamine is known to be in the pathway that can stimulate to be in the pathway that can stimulate to be in the pathway that can stimulate testosterone and so while there isn't a testosterone and so while there isn't a testosterone and so while there isn't a direct relationship between dopamine direct relationship between dopamine direct relationship between dopamine stimulating testosterone there is an stimulating testosterone there is an stimulating testosterone there is an interesting pathway whereby dopamine interesting pathway whereby dopamine interesting pathway whereby dopamine increases can trigger increases in increases can trigger increases in increases can trigger increases in things like luteinizing hormone which things like luteinizing hormone which things like luteinizing hormone which can trigger increases in testosterone as can trigger increases in testosterone as can trigger increases in testosterone as well as estrogen for that matter you are well as estrogen for that matter you are well as estrogen for that matter you are going to do deliberate cold exposure going to do deliberate cold exposure going to do deliberate cold exposure you are going to increase your core body you are going to increase your core body you are going to increase your core body temperature and that makes sense if you temperature and that makes sense if you temperature and that makes sense if you think about how deliberate cold exposure think about how deliberate cold exposure think about how deliberate cold exposure can increase metabolism by increasing can increase metabolism by increasing can increase metabolism by increasing thermogenesis thermogenesis thermogenesis what that all means is that if you are what that all means is that if you are what that all means is that if you are doing your deliberate cold exposure doing your deliberate cold exposure doing your deliberate cold exposure early in the day you are going to get early in the day you are going to get early in the day you are going to get yet a further increase in core body yet a further increase in core body yet a further increase in core body temperature that would be associated temperature that would be associated temperature that would be associated with wakefulness your ability to be with wakefulness your ability to be with wakefulness your ability to be alert that morning or throughout the day alert that morning or throughout the day alert that morning or throughout the day and so on and so on and so on it also means that if you do your it also means that if you do your it also means that if you do your deliberate cold exposure very late in
deliberate cold exposure very late in deliberate cold exposure very late in the evening or at night so 6 p.m 7 P.M 9 the evening or at night so 6 p.m 7 P.M 9 the evening or at night so 6 p.m 7 P.M 9 pm and so on you are going to increase pm and so on you are going to increase pm and so on you are going to increase your core body temperature and if you your core body temperature and if you your core body temperature and if you recall a decrease in core body recall a decrease in core body recall a decrease in core body temperature of one to three degrees is temperature of one to three degrees is temperature of one to three degrees is not just beneficial but is necessary in not just beneficial but is necessary in not just beneficial but is necessary in order to get into deep sleep and remain order to get into deep sleep and remain order to get into deep sleep and remain in deep sleep so the takeaway from this in deep sleep so the takeaway from this in deep sleep so the takeaway from this is deliberate cold exposure done is deliberate cold exposure done is deliberate cold exposure done properly will increase your core body properly will increase your core body properly will increase your core body temperature and make you feel more alert temperature and make you feel more alert temperature and make you feel more alert so if you're doing it early in the day so if you're doing it early in the day so if you're doing it early in the day that's probably terrific given that most that's probably terrific given that most that's probably terrific given that most of us want to be alert during the day of us want to be alert during the day of us want to be alert during the day however if you do it too late in the day however if you do it too late in the day however if you do it too late in the day evening or night it can disrupt sleep by evening or night it can disrupt sleep by evening or night it can disrupt sleep by way of disrupting your core body way of disrupting your core body way of disrupting your core body temperature
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Training the Nervous System
The moment you enter cold water, your body responds as it would to a genuine threat. Norepinephrine and epinephrine surge through the brain and body — the same catecholamines that drive the heightened alertness, the narrowed focus, and the urgency you experience under real-life pressure. This is not a simulation of the stress response. It is the stress response, activated in a context you control, which is precisely what makes deliberate cold exposure such a reliable tool for building resilience.
Because cold reliably and predictably triggers this neurochemical state, it offers something most stressors cannot: a reproducible opportunity to practice staying calm while fully activated. The skill you develop in the cold — remaining composed, regulating breath, holding steady as norepinephrine rises toward clarity — is the same skill that carries you through the most demanding moments of your day. Calm under cold and calm under pressure are not separate capacities. They are the same capacity, trained in the same way.
see those as walls that we want to climb over in order to build resilience and to start counting the number of walls that we traverse
When you are in the cold, two mental approaches help. The first is to settle: use a double inhale through the nose followed by a long, extended exhale to engage your body's calming response and slow the alarm signal while you remain immersed. The second approach is to lean in — to hold the tension without releasing it, to allow the adrenaline to peak and then wait for it to pass without acting on the urge to exit. Neither approach is superior to the other. Your state, the session's demands, and what you are building will determine the right choice.
Over time, you learn to recognize the surges of norepinephrine and epinephrine not as emergencies but as walls — thresholds to cross rather than barriers to avoid. Each crossing expands your resilience. Counting those crossings, noting how the peaks shift over sessions, observing the growing distance between surges: this is deliberate practice in its most direct form. Every wall you traverse in the cold becomes a wall you will find easier to climb elsewhere — in training, in work, in the moments that ask you to hold steady when pressure is highest.
Research in humans points to eleven minutes of total cold exposure per week as the threshold at which meaningful neurochemical and metabolic adaptations begin to accumulate. Distributed across two to four sessions — roughly two to three minutes each — this represents the minimum effective dose for both resilience training and neurochemical benefit. Consistency within that structure matters more than any single exceptional session. Eleven minutes per week, applied with intention and regularity, is where the protocol begins to compound.
Dopamine, Metabolism, and the Søberg Principle
Cold exposure elevates dopamine by approximately 250 percent — not as a brief spike that recedes quickly, but as a sustained release that persists well beyond the session itself. This is why practitioners consistently report feeling better for hours after a cold immersion, even when the experience in the water was demanding. Dopamine, operating alongside norepinephrine, drives the elevated mood, the refined focus, and the sense of clarity that makes cold exposure one of the few physical practices people return to with genuine motivation.
The session itself may be austere — many people find it purely stressful, particularly early in the practice — but the neurochemical aftermath is the reward. Dopamine sustained at 250 percent of baseline is not a subtle shift; it is the same molecule that underlies motivation, goal-directed behavior, and the capacity to sustain attention through difficulty. When that molecule is elevated for hours after your session, the quality of your focus — in work, in training, in conversation — rises with it. This is the mechanism behind the mood elevation that practitioners describe as the reason they return.
Cold exposure also reshapes metabolism through a distinct pathway. It converts white fat cells — low-activity energy stores that accumulate through caloric surplus — into beige and brown fat cells, which are rich in mitochondria and thermogenically active, burning more energy simply to sustain body temperature. More brown and beige fat raises your resting metabolic rate, increasing the number of calories your body burns at baseline. This metabolic floor, elevated through consistent cold exposure, contributes meaningfully to energy balance and supports the conditions for sustained fat loss.
The Søberg principle distills the sequencing insight into a practical rule: end on cold, then reheat naturally. If your session combines heat and cold — sauna and plunge, for instance — finish with cold and allow your body to warm itself without external assistance. Reaching for a hot shower or heated environment immediately after cold short-circuits the thermogenic process you have just activated. Natural reheating forces the body to generate warmth from within, and that effort is where the metabolic adaptation accumulates.
Shivering is the mechanism that links cold exposure directly to brown fat activation. When muscles shiver, they release a molecule called succinate into the bloodstream. Succinate activates brown fat thermogenesis, amplifying the metabolic response to cold and deepening the adaptation across sessions. Shivering during or immediately after exposure is not evidence of inadequate preparation — it is the activation signal. Allow it to run; the body's response to that signal is precisely what the protocol is designed to produce.
Performance Windows, Timing, and Testosterone
Cold exposure is a powerful tool for physical performance — and the window in which you apply it determines whether it accelerates adaptation or works against it. If your primary goal is hypertrophy or strength, avoid cold immersion in the four hours immediately following resistance training. The inflammatory and hormonal signals that arise after strength work are the raw material of muscle adaptation — uncomfortable in the moment, essential in the long run. Cold in that window blunts those signals and diminishes the adaptive return on the session you just completed.
The calculus shifts entirely for endurance training, sprint work, and skill-based sessions. Cold exposure after these sessions does not interfere with the relevant adaptive signals and can meaningfully accelerate recovery by reducing inflammation and clearing metabolic byproducts. For athletes managing high training volume, scheduling cold on days separate from strength work preserves both the performance benefit and the adaptive signal. At sufficient training intensity, cold is not just a recovery option — it is a tool for sustaining the quality of the work itself.
Cold exposure is particularly valuable as an anti-inflammatory tool across the full arc of a training week. Delayed onset muscle soreness builds not just in the hours after a demanding session but across the days that follow, as the inflammatory cascade continues to unfold. Cold exposure applied during that window — even on a day separate from training — reduces the accumulation of soreness and restores training quality faster. Recovery is not a passive state. It is a deliberate practice, applied with the same intention as the training itself.
Cold exposure may also support testosterone through two intersecting physiological pathways. Vasoconstriction in response to cold followed by rebound vasodilation increases blood flow to the affected tissue, supporting organ health and function including in the gonads. Separately, the dopamine increase that cold produces can stimulate luteinizing hormone through a well-established neurological pathway, which in turn supports testosterone synthesis. Both mechanisms point in the same direction and are grounded in established physiology.
The timing of your session within the day carries its own logic. Cold exposure in the morning raises core body temperature, which heightens alertness and sharpens focus — a useful pairing with a day that requires presence and clear thinking. Cold exposure late in the evening raises core temperature at precisely the wrong moment: a drop in core temperature is not merely beneficial for deep sleep, it is required. Exposing yourself to cold too late in the day delays that drop and can fragment sleep, blunting the recovery that the rest of your protocol is designed to deliver. Morning cold is an amplifier; late-evening cold is a liability.
a decrease in core body temperature of one to three degrees is not just beneficial but is necessary in order to get into deep sleep
