The drop-off between your first set and your fifth is not mental — it's thermal. Your palms carry the architecture to clear that heat between efforts; here is the protocol, and the data behind it.
Video·Brain Mindset·11 min read·January 2023
Your palms, face, and the soles of your feet are the body's fastest heat portals. A simple cooling protocol applied between sets may triple your output — no device required.
Temperature Is the Master Variable
Of all the variables that govern physical performance, temperature sits at the top of the hierarchy. Not supplements, not breathwork, not mindset protocols or visualization routines. Temperature — the thermal state of your body at any given moment — determines how much work you can produce, how efficiently your cells recover from that work, and how deeply your body restores itself when the session is over. Most athletes have never interrogated this variable deliberately. That oversight costs more than most realize.
if your brain heats up too much neurons start dying and those neurons don't come back
Consider how temperature governs sleep. The body's transition into deep, restorative rest is not triggered simply by darkness or schedule — it is orchestrated, in significant part, by a carefully timed drop in core temperature. That thermal shift is a biological signal, and without it, the depth and architecture of sleep suffer. If training leaves residual thermal stress in the body, recovery is compromised before you have even closed your eyes. Temperature does not sit alongside sleep as a parallel variable; it sits upstream, setting the conditions under which recovery either happens or does not.
Cold is one of the most powerful performance tools available — and this requires a precise frame. We are not talking about placing ice packs on sore muscles after a hard session, or cooling a mildly injured joint. Thermal physiology — the study of how heat and cold move through the body's distinct compartments and what those movements do at the cellular level — reveals something far more actionable. Strategic application of cold, to the right surfaces, can extend your output in ways that training volume, nutrition, or supplementation alone cannot.
Your body has sophisticated, layered mechanisms designed to prevent overheating during exertion. Blood is redirected toward the skin to radiate heat outward, sweat evaporates from the surface to carry it away, and respiration increases partly as a thermal response. These systems operate in concert, and under moderate conditions, they manage the load effectively. Under sustained, high-intensity effort, however, heat production can outpace the body's capacity to export it — and performance begins to decline, not from insufficient will, but from accumulating thermal pressure the system cannot fully clear.
The science underpinning what follows is not experimental or fringe. Thermal physiology is a mature discipline, built on decades of research into how heat compromises performance in athletes, soldiers, and workers in extreme environments. What emerged from that work — and what remains directly applicable in any gym, on any track, or in any studio — is an understanding that your body already carries its most important cooling infrastructure. You have not been taught to use it. That is the only gap left to close.
Neuroscientist: “Cold Water Will INCREASE YOUR STRENGTH AND ENDURANCE BY 300%”
by doing this repeatedly over several sessions over several weeks they quickly went in the cooling group from a maximum of somewhere between 180 and 200 to 600 pull-ups in the equivalent amount of time which is absolutely incredible today you're going to hear about specific tools that you can use to improve endurance and strength by up to I'm not making this up three or four times your current capacity okay so let's talk about physical performance there are so many variables to physical performance some of them are what I would consider foundational
and if you were to disrupt those you would perform less well like getting a good night's sleep things like being properly hydrated there are supplements there are drugs there are different ways to breathe there are so many tools related to mindset visualization there are machines and devices it's just a vast space and what I believe to be one of the most powerful tools to improve physical performance and skill learning and recovery and that's temperature Believe It or Not temperature is the most powerful variable for improving physical performance and for Recovery
it's even more important than sleep because temperature itself is going to dictate how well and when you sleep and the depth of your Total Recovery there are two aspects to temperature of course there's heat and there's cold we are mainly going to focus on cold as a way to buffer heat cold I would argue is even more powerful than heat as a tool and I'm not just talking about putting ice packs on sore muscles or slightly sprained Limbs and ankles and things of that sort we're going to talk about cold
from the standpoint of thermal physiology this is a literature that's rich in scientific information where physiologists and neuroscientists figured out that there are different compartments in your body that heat and cool you differently and that you can leverage those in order to double and as I mentioned before even triple or quadruple your work output both strength repetitions and endurance it's not just about performing well once it's about being able to perform well and recover from that performance so that you do even better when you're not incorporating these tools what is
temperature how does temperature impact the body and its ability to perform including learn new skills heating up too much is just plain bad it's not just bad for physical performance it's bad for all tissue health if your brain heats up too much neurons start dying and those neurons don't come back and you don't want to lose neurons in the central nervous system if you get too hot that'll happen it's called hyperthermia you want to avoid hyperthermia and you have many mechanisms that are built into you to avoid becoming hyperthermic the
other thing that happens when we get too warm is that we have in all of our cells what are called enzymes enzymes are proteins and they have a particular structure and their structure becomes modified when heat increases and that's not good so one of the reasons why the body and nature goes through so much effort to build in mechanisms to make sure that we don't become too warm is because when we get too warm these enzymes don't function cells stop functioning they stop being able to generate energy they stop being
able to digest things you stop being able to think and eventually those cells start dying off entirely we have much more flexibility in terms of getting cold now you don't want to become hypothermic either you can die from hypothermia just like you can die from hyperthermia however that you have a lot more range to be cold than you do to be too warm the idea is to keep the body and brain in a particular range but anytime we do anything our body temperature can shift now what are those things well
they're a huge category of them when you get into cold water you secrete adrenaline on a hot day if it's really hot or in a very hot sauna or in the hot desert you will generate what are called heat shock proteins which will set off other sets of Cascades metabolic Cascades biological Cascades but the simplest way to think about this process is that when we get cold we tend to vasoconstrict We tend our blood vessels tend to constrict and we tend to push energy toward the core of our body to
preserve our core organs when we heat up our blood vessels vasodilate they expand a bit and more blood flows to our periphery and more blood can move throughout the body generally and we will perspire we will sweat so they can be dumped we are dumping heat and now the most important thing to understand is that if you get too hot not only do those enzymes stop working but your ability to contract your muscles stops ATP is involved in the process of generating muscle contractions doesn't matter if you're running a marathon
doesn't matter if you're doing a yoga class doesn't matter if you're going for a 700 pound squat the range of temperatures within which ATP can function and muscles can contract is very narrow somewhere around 39 or 40 degrees Celsius it drops off and you will not be able to generate more contractions that temperature can be generated locally really fast if you can keep temperature in range however in a proper range you will be able to do more work you will be able to create greater output you'll be able to lift
more weight more sets more reps and you'll be able to run further so how do you dump heat in order to perform longer safely well in order to understand that you have to understand that the body has three main compartments for regulating temperature and there's one compartment in particular that all of you have and if you can understand how that works you can do tremendous things for your performance and for your recovery one is your core we already talked about that the other is your periphery which are obviously your arms
and your legs and your feet and your hands but then there's a third component which is there are three locations on your body that are far better at passing heat out of the body and bringing cool into the body such that you can heat up or cool your body everywhere very quickly face the palms of your hands and the bottoms of your feet what's special about those areas of your body the arrangement of vasculature of blood vessels capillaries and arteries that serve those regions is very different than it is elsewhere
in your body there's a rule in vascular biology that blood moves from arteries to capillaries and then to veins and then back to the heart these three regions of your hands your face and the bottoms of your feet we have what are called avas avas are a very special pattern of vasculature but avas are direct connections between the small arteries and the small veins they bypass the capillaries to some extent these avas allow more heat to leave the body more quickly and more cool to enter the body more quickly in
other words you can heat up best at the face The Palms and the bottoms of the feet and you can cool down best at the face The Palms and the bottoms of the feet than you can anywhere else on your body when I say heat up or cool down I mean actually heat or cool the core end your brain okay they were studying overheating in athletes and in military and in construction workers and trying to prevent it and they did a bunch of experiments what they essentially found was that cooling
The Palms Palmer Cooling allowed people athletes and recreational athletes to run much further to lift more weight and to do more sets and Reps to a absolutely staggering degree what they essentially did is they brought someone into their Laboratory who could do 10 pull-ups on the first set and they were able to get 10 rest two or three minutes get another 10 rest two or three minutes and if you've ever tried this what you find is that you start dropping to eight seven six Etc then they used a device they
had people hold on to what was essentially a cold tube that cool from the cold tube passes into the hand these so-called polymer regions and then cools the core and in theory by lowering body temperature would allow the person or the athlete to do more work chill data the specific data showed that subjects could do at least the subjects they worked with on their first day with no cooling about a hundred pull-ups across the time frame that they had then they came back and did the cooling they did it the
very next day and they found that they went to 180 pull-ups which is incredible it's a near doubling and by doing this repeatedly over several sessions over several weeks they quickly went in the cooling group from a maximum of somewhere between 180 and 200 as I recall I'm sort of estimating now to 600 pull-ups in the equivalent amount of time which is absolutely incredible so how can you start to incorporate this well first of all I always get asked how cold should the water be should it be ice water should
it be very cold water the answer is no want to experience some of this effect without a device good do your maximum number of pull-ups stop and then you could actually put your hands into or on the surface of a sink that is presumably stopped up with cool water so not ice water not freezing cold but cool water slightly cooler than body temperature before you started training would be a good place to start you do that for 10 to 30 seconds then you could go back and do your next set
you would repeat the cooling you would want to extend the amount of cooling somewhat so you might want to do that for 30 seconds to a minute this is not going to be perfect you're going to have to play with how cold to make it in order to get the optimal effect same is true if you're running and you're fatiguing obviously you don't want to become hyperthermic cooling the hands or the bottoms of your feet or the face would be the ideal way to dump heat in order to be able
to generate more output you could take a frozen juice can if you have one of those or a very cold can of soda and you would want to pass it back and forth between your two hands the reason the passing back and forth is really important is because you again you don't want to be so cold that you constrict those venous portals that will allow cold to go into the body once again we've covered a lot of material by now you should understand a lot about how your body Heats and
cools itself and the value of that for physical performance I hope you also appreciate that you have tools at your disposal to vastly improve your physical performance and should you try those please let us know how it goes if you decide to do polymer cooling during your runs or after your runs during your weight workouts during your yoga sessions whatever it is let us know please place that in the comments
Transcript auto-generated by YouTube. Verbatim — duplicates intentionally preserved.
Why Heat Ends Your Set Early
Every cell in your body depends on enzymes to function. These proteins are the molecular workers that drive each chemical reaction — digesting fuel, generating energy, coordinating the metabolic processes that power movement, thought, and recovery. Their function depends on maintaining a precise three-dimensional shape, and that shape is temperature-sensitive. When cellular temperature climbs beyond a threshold, enzyme structure degrades, reactions slow, and energy production falls. This is not a metaphor for fatigue; it is the specific mechanism by which heat ends performance at the most fundamental level.
Muscle contraction operates on the same thermal logic. The molecule that powers the mechanical shortening of muscle fibers — ATP — functions within a narrow temperature range, and research places the functional ceiling at roughly 39 to 40 degrees Celsius. Above that threshold, ATP-driven contraction begins to fail and output collapses. The drop is not gradual in the way fatigue is gradual — it is a hard biological limit. When the working muscle approaches it, the machinery that produces force stops, and what feels like a mental wall is a physical ceiling.
somewhere around 39 or 40 degrees Celsius it drops off and you will not be able to generate more contractions
This is the hidden mechanism behind a pattern every serious athlete recognizes. The first set is strong. The second is slightly less. By the fourth or fifth, you are managing numbers rather than building them. Metabolic byproducts, neural fatigue, and substrate depletion all contribute — but local muscle heat is a significant, underappreciated driver of that decline. Each set generates heat faster than the body can export it from the working tissue, and as temperature climbs, the ceiling for force production descends to meet it. The muscle is not giving up; it is reaching a limit you cannot see.
The body responds to this pressure actively and intelligently. Vasodilation — the widening of blood vessels serving the heated muscle — increases local blood flow, bringing cooler blood from the core and carrying heat away, which preserves performance and the clarity needed to keep working. This response holds while the cardiovascular system has the capacity to sustain it. But under sustained, high-intensity effort, the heart is already taxed: delivering oxygen, clearing metabolic waste, maintaining pressure. Heat export becomes a competing demand, and there is a point at which the system can no longer fully meet all of them.
The far end of this process is hyperthermia — a state in which rising core temperature compromises function across the body, degrading clarity, coordination, and cellular integrity broadly. Most people training indoors will never reach that clinical threshold. But many train regularly within striking distance of their individual thermal ceiling, without recognizing that the ceiling exists. Understanding performance decline as a thermal phenomenon — a biological constraint with a specific mechanism — transforms it from something you simply endure into something you can manage with intention, and the output you recover is real.
The Three Portals: Palms, Face, Feet
Temperature regulation in the body is organized across three distinct compartments. The core — heart, lungs, liver, brain — is the most protected zone; its temperature is the last to shift and the most carefully defended. The periphery, encompassing the limbs and trunk, acts as a large thermal buffer, absorbing heat from working muscles and radiating it outward when conditions allow. But there is a third category, smaller in surface area and far greater in thermal capacity: three specific zones that move heat with a speed and efficiency available nowhere else on the body.
Those zones are the palms of your hands, the soles of your feet, and the skin of your face. Their exceptional capacity comes from a specialized vascular architecture called arteriovenous anastomoses — AVAs. In most regions of the body, blood moves through arteries, then capillaries, then veins in a graduated, distributed pathway optimized for nutrient delivery. In the palms, soles, and face, AVAs create direct connections between small arteries and small veins, bypassing the capillary bed almost entirely. Blood — and the heat it carries — moves through these zones at a speed the rest of the body simply cannot match.
Cooling the palm does not merely cool the skin of the hand — it cools the blood returning toward the core, which reduces temperature at the heart, the lungs, and the brain. The palm functions as a radiator you can deliberately engage: place it against a cooler surface, and the AVA network drives heat outward at a rate no other surface can approach. A brief window of palm cooling can produce measurable core cooling, restoring the physiological conditions for sustained performance and focus far faster than passive rest alone.
The temperature of the cooling medium is not a minor detail — it is the mechanism itself. When the palm encounters extreme cold, the body's protective response is vasoconstriction: the blood vessels serving the area contract to shield the tissue, and the AVA channels close. The very structures enabling rapid heat exchange become unavailable, and the portal shuts. Ice water is counterproductive not because cold is wrong but because extreme cold defeats the physiology you are trying to engage. The exchange requires an open vessel, and extreme temperature closes it.
not ice water not freezing cold but cool water slightly cooler than body temperature
The effective temperature range is modest and forgiving. Water that feels distinctly cool to the touch — not ice-cold, not merely tepid — is sufficient to create the thermal gradient the AVAs need to drive rapid exchange. Cool tap water falls within this range in most environments. The body is already calibrated for this: it is the same instinct that makes you hold a cool glass rather than press ice against your palm. Find the gradient, and the physiology does the rest. Stillness is not required — just the right surface, at the right temperature, at the right moment.
The Protocol — and the Pull-Up Data Behind It
The research behind palmer cooling is specific, and the numbers deserve attention. In controlled experiments, conditioned athletes came into a laboratory able to produce approximately 100 pull-ups across a standard training session — a solid baseline. They returned the following day using a palm cooling device between sets, designed to bring the AVA zones into contact with a precisely cooled surface without triggering vasoconstriction. Output climbed to 180 pull-ups — a near-doubling from one session of deliberate thermal management between efforts, with no other change in training or recovery.
Sustained across multiple sessions over several weeks, the compounding effect became decisive. The cooling group progressed from that 180-pull-up baseline to 600 pull-ups within the same training window — a six-fold increase from the original capacity. Control subjects improved as well, as any structured program produces adaptation. But the gap between groups was not marginal; it was the difference between working within a managed thermal ceiling and working without one. What appears in the data as strength or endurance is, in meaningful part, a story about thermal management.
Replicating this without laboratory equipment is straightforward. Between sets, submerge your palms in cool water for ten to thirty seconds. As the session progresses and local heat accumulates, extend that window to thirty to sixty seconds. A sink, a bucket, a bowl — the delivery method is secondary to the principle. You will often sense the effect before you measure it: a restored quality of readiness, a shift in the willingness of the working muscles to engage again. That is the body accurately reporting its thermal state. Follow it.
When a sink is not available, a chilled can or cold bottle passed back and forth between both hands produces a comparable result. The passing motion is deliberate: it prevents any patch of skin from cooling to the point of vasoconstriction, keeping the AVA network open and active in both palms simultaneously. Passing the can is not incidental — it is how you maintain the gradient and keep the portal open. The result is continuous, bilateral thermal exchange through both palms, approximating what a more controlled setup delivers without any equipment at all.
The portals respond to the same principle regardless of the activity generating the heat. Running intervals, rowing sets, yoga sequences, cycling efforts — any repeated-effort work that produces progressive thermal accumulation can benefit from deliberate portal cooling between rounds. Your palms do not distinguish between pull-ups and hill sprints; they detect a thermal gradient and respond to it. Apply cool to the right surface at the right moment, and you extend the window where sustained output is possible. The protocol is simple. What it returns to you is not.
