Cold exposure reshapes metabolism, trains mental resilience, and accelerates recovery — but the protocol details determine whether it works. What the science says, and how to apply it deliberately.
Video·10 min read·June 2026
A conversation on how cold exposure reshapes metabolism, builds mental resilience, and supports recovery — and the protocols that make it work.
Starting with Discomfort
For most people, cold water announces itself as an idea before it becomes a practice. A documentary, a headline, a friend who has already crossed over. The 2015 Vice film on Wim Hof reached a particular kind of person: curious, skeptical, and willing to sit with an unfamiliar concept long enough to let it take root. Cold water wasn't a known quantity — it was an edge, something practiced at the margins. After that film, the question shifted from whether any of this was real to whether you were willing to find out.
I really think there's some power in the consistency of it and rewriting like neural pathways in there.
Curiosity is fragile. It doesn't survive sustained cold on its own. What converts a single experience into a consistent protocol is the recognition that each session asks something real of you — and that answering that request, every day, changes you. The physical benefits arrived gradually, over months of practice. The mental shift came first, and proved harder to dismiss.
Mental resilience is the primary reason serious practitioners keep returning to cold water. The practice doesn't offer comfort; it offers contrast. Cold immersion activates the sympathetic nervous system — the same system that coordinates the body's response to all forms of stress — and over time, that repeated activation trains regulation. The result is a baseline of calm and focused alertness that carries into the rest of the day, present even when the cold is not.
There is something specific about doing something hard on purpose, every single day. The deliberateness is what matters. Each session is a small act of choosing discomfort over ease, and the accumulation of those choices rewires the neural pathways that govern how the mind encounters pressure. The response becomes cleaner. The return to equilibrium arrives faster.
Cold water, practiced with consistency, becomes less about the water and more about the intention behind entering it. The protocol holds because the commitment holds. Early sessions feel like confrontation. Later ones feel like a return — something to come back to not out of obligation but because the clarity afterward is real and repeatable. That gap, between who you are before and who you are after, is what keeps the practice alive.
Think of it the way you might think of fasting: the physical benefits are substantial, but the discipline carries its own return. You are training a quality of mind alongside a physiological adaptation. The body improves; the person behind the body changes more. That is the deeper yield of cold water practice, and it is the one that proves hardest to walk away from once you have felt it.
ryan welcome to the podcast ryan welcome to the podcast ryan welcome to the podcast great to be here thanks for having me i great to be here thanks for having me i great to be here thanks for having me i am excited to chat about cold because am excited to chat about cold because am excited to chat about cold because this is something i've been getting a this is something i've been getting a this is something i've been getting a lot more into this past year but before lot more into this past year but before lot more into this past year but before we jump into that i have a note in my we jump into that i have a note in my we jump into that i have a note in my show notes that you broke your back show notes that you broke your back show notes that you broke your back running with bulls and i have got to running with bulls and i have got to running with bulls and i have got to hear this story hear this story hear this story yes so after my early 20s i moved to yes so after my early 20s i moved to yes so after my early 20s i moved to
what i want to really go deep with you what i want to really go deep with you on today so to start broad i'd love to on today so to start broad i'd love to on today so to start broad i'd love to hear how you got into the world of cold hear how you got into the world of cold hear how you got into the world of cold therapy therapy therapy i got into it uh in 20 well i first i got into it uh in 20 well i first i got into it uh in 20 well i first learned of it in 2016 or actually 2015 learned of it in 2016 or actually 2015 learned of it in 2016 or actually 2015 when the um when the um when the um wim hof documentary came out on vice wim hof documentary came out on vice wim hof documentary came out on vice and i remember and i remember and i remember seeing that i had no clue who wim was seeing that i had no clue who wim was seeing that i had no clue who wim was cold water wasn't really
benefits are benefits are something that we're still something that we're still something that we're still figuring out it's it's one i could speak figuring out it's it's one i could speak figuring out it's it's one i could speak for myself with the benefits of you know for myself with the benefits of you know for myself with the benefits of you know why why i do it it is the why why i do it it is the why why i do it it is the mental resiliency it's the consistency mental resiliency it's the consistency mental resiliency it's the consistency of doing something hard daily and i of doing something hard daily and i of doing something hard daily and i really think there's some power in the really think there's some power in the really think there's some power in the consistency of it and rewriting consistency of it and rewriting consistency of it and rewriting like neural pathways in there so though like neural pathways in there so though like neural pathways in there so though getting into the cold the big thing that
they've turned to a lot of different they've turned to a lot of different things like we just recently this is one things like we just recently this is one things like we just recently this is one that just happened recently we had a that just happened recently we had a that just happened recently we had a person that had cove coven they had person that had cove coven they had person that had cove coven they had coveted long-haul and they were coveted long-haul and they were coveted long-haul and they were you know had tried everything they were you know had tried everything they were you know had tried everything they were in studies they were taking all the in studies they were taking all the in studies they were taking all the medications out there medications out there medications out there and and and we get a text and the the guys had the we get a text and the the guys had the we get a text and the the guys had the unit for a week and his recovery score
the contrast is the contrast is so first like for cold one of the main so first like for cold one of the main so first like for cold one of the main mechanisms if you're just doing cold is mechanisms if you're just doing cold is mechanisms if you're just doing cold is a lot of people do it are really a lot of people do it are really a lot of people do it are really attracted to it right now for metabolism attracted to it right now for metabolism attracted to it right now for metabolism increase and so the cold is really increase and so the cold is really increase and so the cold is really phenomenal to get in and stay cold it's phenomenal to get in and stay cold it's phenomenal to get in and stay cold it's the body kind of adapting the body kind of adapting the body kind of adapting um um um [Music] [Music] [Music] strictly to the cold so if you're going
now he's he did the deep dive onto now he's he did the deep dive onto metabolism metabolism metabolism um um um and he his big thing is taking us to and he his big thing is taking us to and he his big thing is taking us to it's you really want to take yourself to it's you really want to take yourself to it's you really want to take yourself to a shiver a shiver a shiver and that shiver response sends and that shiver response sends and that shiver response sends is some sort of trigger into the body to is some sort of trigger into the body to is some sort of trigger into the body to um um um [Music] [Music] [Music] on the metabolism side and there's the
start to get the benefits and how long start to get the benefits and how long um because i've read for instance some um because i've read for instance some um because i've read for instance some data that even in like in the low 50s data that even in like in the low 50s data that even in like in the low 50s you're getting you're getting you're getting that tangible benefit you're hitting that tangible benefit you're hitting that tangible benefit you're hitting shiver response and then maybe there's shiver response and then maybe there's shiver response and then maybe there's no need to push it into the 30s to no need to push it into the 30s to no need to push it into the 30s to actually get those benefits actually get those benefits actually get those benefits absolutely i absolutely i absolutely i i actually encourage anyone that you i actually encourage anyone that you i actually encourage anyone that you know any of our people that get a plunge
yeah i think of it a little like fasting yeah i think of it a little like fasting where there's certainly physical where there's certainly physical where there's certainly physical benefits as well but i feel like the benefits as well but i feel like the benefits as well but i feel like the resiliency and that building that mental resiliency and that building that mental resiliency and that building that mental toughness is a huge advantage of the toughness is a huge advantage of the toughness is a huge advantage of the cold and especially i was so resistant cold and especially i was so resistant cold and especially i was so resistant to it i've it's been really fun to see to it i've it's been really fun to see to it i've it's been really fun to see my ability to stay and go up over time i my ability to stay and go up over time i my ability to stay and go up over time i also am competitive so i know in myself also am competitive so i know in myself also am competitive so i know in myself i've pushed it a few times just to prove i've pushed it a few times just to prove i've pushed it a few times just to prove i could and stayed in for too long and
and i heard even tim ferriss 10 years ago talk about this that there's a ago talk about this that there's a ago talk about this that there's a special benefit to cooling kind of the special benefit to cooling kind of the special benefit to cooling kind of the brain stem back the neck area for the brain stem back the neck area for the brain stem back the neck area for the metabolism side and for burning fat and metabolism side and for burning fat and metabolism side and for burning fat and for that brown fat creation there seems for that brown fat creation there seems for that brown fat creation there seems to be a signaling mechanism connected to to be a signaling mechanism connected to to be a signaling mechanism connected to the hypothalamus they think um because the hypothalamus they think um because the hypothalamus they think um because he even recommended you know you can put he even recommended you know you can put he even recommended you know you can put an ice pack on the back of your neck and an ice pack on the back of your neck and an ice pack on the back of your neck and get some of the effects because of that get some of the effects because of that
um to what that's the pure intention um to what that's the pure intention that we're doing of getting into the that we're doing of getting into the that we're doing of getting into the cold waters to stress our body out um cold waters to stress our body out um cold waters to stress our body out um so you know if you have heart issues so you know if you have heart issues so you know if you have heart issues that's definitely one to that's definitely one to that's definitely one to monitor whether it's talking to your monitor whether it's talking to your monitor whether it's talking to your health practitioner health practitioner health practitioner or or or just easing in you know starting out just easing in you know starting out just easing in you know starting out your first time and and your first time and and your first time and and and it's a new way to learn your body so
um um just encouraging people like it's kind of a self-exploration thing it's kind of a self-exploration thing it's kind of a self-exploration thing and then on the data standpoint i don't and then on the data standpoint i don't and then on the data standpoint i don't i don't have anything to really bring i don't have anything to really bring i don't have anything to really bring forward there forward there forward there for a lot of our listeners um most for a lot of our listeners um most for a lot of our listeners um most people listening are mom so another people listening are mom so another people listening are mom so another question i know we're gonna get is what question i know we're gonna get is what question i know we're gonna get is what about kids and i'll say on a personal about kids and i'll say on a personal about kids and i'll say on a personal level again not medical advice but i level again not medical advice but i level again not medical advice but i
tell them to get out but it's fun to tell them to get out but it's fun to watch my kids because especially the watch my kids because especially the watch my kids because especially the younger ones their responses are so younger ones their responses are so younger ones their responses are so natural they usually start laughing natural they usually start laughing natural they usually start laughing which speaks to all the release of all which speaks to all the release of all which speaks to all the release of all the neurotransmitters and dopamine the neurotransmitters and dopamine the neurotransmitters and dopamine that's happening when you get in cold that's happening when you get in cold that's happening when you get in cold water um yeah it's a lot of fun to watch water um yeah it's a lot of fun to watch water um yeah it's a lot of fun to watch another tip i have personally is when i another tip i have personally is when i another tip i have personally is when i was trying to do like work up to five was trying to do like work up to five was trying to do like work up to five minutes a day i would put on
on our workouts but on our workouts but like i was talking to dr kelly starrett like i was talking to dr kelly starrett like i was talking to dr kelly starrett about this he's kind of a about this he's kind of a about this he's kind of a recovery expert recovery expert recovery expert and and and his big thing is i would he said if i had a client i i would he said if i had a client i i would he said if i had a client i would that they're a bodybuilder or would that they're a bodybuilder or would that they're a bodybuilder or some professional athlete yes i would some professional athlete yes i would some professional athlete yes i would recommend them probably not to get in recommend them probably not to get in recommend them probably not to get in the cold right after their workout the cold right after their workout the cold right after their workout
understand it um understand it um there's really good yeah that's a it's a there's really good yeah that's a it's a there's really good yeah that's a it's a it's a unique one online where there's it's a unique one online where there's it's a unique one online where there's there's probably a lot of other things there's probably a lot of other things there's probably a lot of other things under the surface that's happening that under the surface that's happening that under the surface that's happening that we don't even quite realize yet and like i mentioned most people and like i mentioned most people and like i mentioned most people listening are parents so i'm curious if listening are parents so i'm curious if listening are parents so i'm curious if you've heard any you've heard any you've heard any specific kind of cool unexpected things specific kind of cool unexpected things specific kind of cool unexpected things from families specifically who from families specifically who from families specifically who
out of uh man there's got to be a way to out of uh man there's got to be a way to make this more affordable than the few options more affordable than the few options more affordable than the few options where that were on the market at the where that were on the market at the where that were on the market at the time and we did come up with something time and we did come up with something time and we did come up with something that we thought was that we thought was that we thought was you know is you know is you know is both men and women really enjoyed it it both men and women really enjoyed it it both men and women really enjoyed it it looks good it's effective it's clean looks good it's effective it's clean looks good it's effective it's clean it's cold it's on demand whenever you it's cold it's on demand whenever you it's cold it's on demand whenever you want it want it want it
like cold plunge is one part of many like cold plunge is one part of many many things we can do for health and i'm many things we can do for health and i'm many things we can do for health and i'm a huge fan i'm curious for you what some a huge fan i'm curious for you what some a huge fan i'm curious for you what some of the other things that are your of the other things that are your of the other things that are your non-negotiables when it comes to health non-negotiables when it comes to health non-negotiables when it comes to health or maybe your own 80 20 of things that or maybe your own 80 20 of things that or maybe your own 80 20 of things that you feel like give you the biggest bang you feel like give you the biggest bang you feel like give you the biggest bang for your buck and when it comes to for your buck and when it comes to for your buck and when it comes to staying healthy i mean to me it's it's simple i mean i have a simple i mean i have a simple i mean i have a list of supplements and products that i list of supplements and products that i
monkey mind so when those start to monkey mind so when those start to separate we get that those moments of separate we get that those moments of separate we get that those moments of clarity those moments of peace um so clarity those moments of peace um so clarity those moments of peace um so floating is a big floating is a big floating is a big a bit a big advocate of that um a bit a big advocate of that um a bit a big advocate of that um you know whether that's once a month you know whether that's once a month you know whether that's once a month twice a month however you can get in twice a month however you can get in twice a month however you can get in that's it that's a huge huge tool that's it that's a huge huge tool that's it that's a huge huge tool yeah i've done some floating in the past yeah i've done some floating in the past yeah i've done some floating in the past as well and it's amazing how it both as well and it's amazing how it both as well and it's amazing how it both seems like you're in there forever and
important signaling mechanism and it important signaling mechanism and it skin exposure to me is very important skin exposure to me is very important skin exposure to me is very important but also it's people don't realize but also it's people don't realize but also it's people don't realize there's sensors in our eyes that respond there's sensors in our eyes that respond there's sensors in our eyes that respond very drastically to natural sunlight so very drastically to natural sunlight so very drastically to natural sunlight so even just 10 minutes of being outside on even just 10 minutes of being outside on even just 10 minutes of being outside on a break on lunchtime go for a walk it a break on lunchtime go for a walk it a break on lunchtime go for a walk it makes a huge difference in your hormones makes a huge difference in your hormones makes a huge difference in your hormones over time um just like we've talked over time um just like we've talked over time um just like we've talked about with cold that like hormetic about with cold that like hormetic about with cold that like hormetic stress from cold can make a huge
it actually tends to make people less it actually tends to make people less afraid of actually dying and more afraid of actually dying and more afraid of actually dying and more content in life i love that you brought content in life i love that you brought content in life i love that you brought that up that up that up that's the that's the key i really take that's the that's the key i really take that's the that's the key i really take from i mean the book really hammers at from i mean the book really hammers at from i mean the book really hammers at home but it's like home but it's like home but it's like the more we're open to our death you the more we're open to our death you the more we're open to our death you know the more we're going to openly live know the more we're going to openly live know the more we're going to openly live life and it's this paradox that they life and it's this paradox that they life and it's this paradox that they dance together and i
yeah just the coldplunge.com yeah just the coldplunge.com it's our site there we have great blog it's our site there we have great blog it's our site there we have great blog with the cover even more of these topics with the cover even more of these topics with the cover even more of these topics that we've discussed has our products that we've discussed has our products that we've discussed has our products there there there um so the coldplunge.com awesome well ryan thank you for your awesome well ryan thank you for your awesome well ryan thank you for your time thanks for all that you do and for time thanks for all that you do and for time thanks for all that you do and for spending time educating us spending time educating us spending time educating us today likewise katie appreciate you today likewise katie appreciate you today likewise katie appreciate you having me on having me on having me on
Transcript auto-generated by YouTube. Verbatim — duplicates intentionally preserved.
The Shiver Response and Metabolic Activation
When the body enters cold water and stays there, something fundamental shifts. The organism that was warm must now work — actively, continuously — to maintain its core temperature. That effort is metabolic in nature: the body reroutes energy, increases heat production, and begins the cascade of adaptation that distinguishes a sustained cold session from a brief shock. Metabolism doesn't respond to cold exposure passively. It activates — and the depth of that activation is determined not by how cold the water is, but by how long the body is held at the threshold.
The shiver response is the key metabolic trigger. When the body reaches the point of involuntary muscular contraction to generate heat, it has crossed into the zone where meaningful adaptation begins. Reaching shiver is more important than going colder. The extremity of the temperature is not the point. The body doesn't need to be pushed to its edge to receive the signal — it needs to be held at the threshold long enough for the system to respond.
You really want to take yourself to a shiver.
Water in the low 50s Fahrenheit is sufficient to trigger that threshold for most people. There is no metabolic advantage to pushing into the 30s — and doing so increases risk without proportional return. The benefit lives in reaching and sustaining the shiver response, not in the severity of the cold. More extreme is not more effective. Consistent, sufficient, and deliberate is the standard that produces lasting adaptation.
There is a specific region where cold exposure carries a distinct metabolic effect: the back of the neck and the brain stem beneath it. The hypothalamus — which regulates temperature, hormones, and metabolic rate — receives a distinct signal when this area is cooled. The evidence points toward a connection between this pathway and brown adipose tissue activation: brown fat generates heat by burning calories rather than storing them, contributing to thermogenesis and the sustained energy and metabolic clarity that consistent cold practice tends to produce.
That mechanism has a practical application. An ice pack applied to the back of the neck can engage the same signaling region without requiring full immersion — a useful entry point for someone new to cold exposure, or a complement for days when a full session isn't accessible. The temperature-sensing network concentrated in that region responds to localized cold, making this a legitimate and low-barrier way to begin engaging the metabolic benefits of deliberate cold practice.
The metabolic case for cold exposure is more precise than the popular narrative suggests. It is not about the shock of extreme temperatures; it is about sustained engagement with a specific threshold — the point at which the body is forced to adapt. That adaptation, reached consistently and with intention, is where the benefit lives. Temperature is a tool, and shiver is the signal. The signal doesn't require suffering to be heard.
Recovery, Contrast, and When to Hold Back
Recovery is where cold exposure produces some of its most immediate and observable returns. Consider one account that stays with practitioners in this space: an individual managing long COVID — having tried medications, enrolled in studies, and exhausted conventional support — began using a cold plunge unit at home. After one week, recovery scores showed a marked and unexpected improvement. The case isn't a clinical trial, but it points toward something worth taking seriously: when the body is given the right intentional stress at the right intensity, resilience can respond more quickly than most protocols anticipate.
Contrast therapy — alternating between heat and cold in a deliberate sequence — is a distinct protocol from cold-only immersion, and the distinction matters. When the body moves from the deep vasodilation of heat into the vasoconstriction of cold, circulation is actively trained. Blood moves with purpose; the cardiovascular system adapts. The recovery effect of contrast is rooted in that rhythmic movement — the body's circulatory intelligence engaged and challenged in a way that either modality alone cannot replicate. Each has value on its own; used together, they create something different.
Timing is an important variable, particularly for athletes focused on strength and hypertrophy. Cold immersion immediately following a resistance training session can blunt the inflammatory response that drives muscular adaptation — the signal the body uses to grow stronger. Separating the cold session from the strength session by several hours, or reserving it for recovery days, preserves both the training signal and the restorative benefit of cold exposure. Protocol design requires this level of intention. The tools work best when placed deliberately.
Cold water is intentional stress on the cardiovascular system. The shock of immersion activates the sympathetic nervous system, elevating heart rate and triggering a cascade of adaptation that is, for most people, manageable and beneficial. For those with existing heart conditions, that same response warrants care and a measured approach. Gradual entry — beginning slowly, attending to the body's signals at each stage — is not weakness. It is precision, and it is where the practice begins for many.
A conversation with a practitioner before beginning cold immersion is appropriate for anyone whose cardiovascular history gives them reason to pause. The early sessions, in any case, are not about duration or temperature. They are about learning the body's language — how it responds when the choice is made to stay rather than leave, where it holds tension, what it reveals under pressure. Starting slowly is how that knowledge accumulates. Cold exposure is a form of self-exploration; the practice teaches you about yourself as much as it trains you.
Cold exposure, used with intelligence, is as much a practice of deliberate restraint as of intentional challenge. The science continues to develop; individual response varies. What holds constant is the underlying principle: stress applied with care, at the right intensity, in the right context, produces adaptation. That is true for metabolism, for cardiovascular function, and for the broader resilience the practice builds over time. The cold teaches precisely what it delivers.
Cold as One Part of the Protocol
Children placed in cold water tend to laugh — not after the session, but immediately, instinctively, without prompting. That spontaneous response is a visible marker of something measurable: dopamine and other neurotransmitters releasing as the body responds to the cold. The neurochemical shift that adults work to articulate — the clarity, the elevated mood, the sense of reset — children express in pure laughter. Dopamine, released in this context, sharpens focus and elevates mood; what registers in the body as joy, the nervous system reads as restored alertness and vitality.
They usually start laughing, which speaks to all the release of all the neurotransmitters and dopamine that's happening when you get in cold water.
Floating — extended time in a sensory deprivation environment — operates on a different axis than cold, but belongs in the same conversation. Where cold activates, floating quiets. The practice interrupts the background noise of the mind: the persistent layer of thought and obligation that doesn't fully release even in ordinary rest. When that layer separates, clarity arrives. Stillness, genuine stillness, becomes accessible — and floating, done regularly, creates the conditions for that presence, complementing the activation of cold with an equally deliberate practice of recovery and calm.
Ten minutes of outdoor sunlight, taken consistently, is a hormetic stress in its own right. Photoreceptors in the eyes respond to natural light with a precision that indoor lighting cannot replicate, triggering cascades that influence hormone balance, circadian rhythm, and the body's baseline capacity for vitality and longevity. Like cold, the mechanism is quiet; the outcome, accumulated over weeks, is not. Skin exposed to natural light, eyes open to the outdoor spectrum: these are inputs the body was built to receive, and withholding them carries a cost that accumulates in silence.
Cold plunge is one ritual inside a broader protocol — not the whole answer. The body responds to the sum of what it receives: cold, warmth, light, stillness, movement, rest. Each input interacts with the others; each ritual reinforces the next. Building a practice means creating the conditions for the body to do what it already knows how to do. The cold is one deliberate entry point into that process — and one of the most direct paths toward the resilience that compounds.
