Cold Plunge Breathwork: An Expert’s Guide

Stop Doing Wim Hof Breathwork in a Cold Plunge. Do This Instead.

Many people who buy a cold plunge were first inspired by Wim Hof. When their cold plunge arrives, they make the same mistake: they look up Wim Hof on YouTube, learn the 30-breath hyperventilation pattern, and bring that practice into the water. It feels intuitive. And it also happens to be a combination that has killed people.

Wim Hof breathwork and Wim Hof cold immersion are two separate practices. Doing the breath pattern first and then submerging can trigger a shallow-water blackout. You pass out. In a cold tub, by yourself, that is fatal.

This article is not about blaming Wim Hof, but about highlighting a common misconception that many people, including myself, followed. We saw Wim Hof performing his warrior breathwork technique and breath holds while he was in the water, and assumed we should be doing the same thing.

To clear up the misconceptions on how to perform breathwork properly while cold plunging, we invited breathwork coach Jon Paul Crimi to show the right way to breathe before, during, and after a plunge. You will learn:

A three-gear system you can use today
The mental cue he teaches kids so they never forget it
Two things you should never do in the water.

By the end of reading this article, you will be ahead of 99% of cold plungers when it comes to leveraging breathwork to maximize your experience.

Meet Your Coach: Jon Paul Crimi

Jon Paul Crimi is a certified breathwork facilitator and teacher trainer with more than 15 years of practice. He is an organizational member of the International Breathwork Foundation and has been featured on Good Morning America, Huffington Post, and The Hollywood Reporter. He runs Breathe with JP and trains breathwork teachers worldwide.

JP owns a BlueCube. He loves contrast therapy and believes it is intimately connected to breathwork. Both are tools to modulate your nervous system. When combined in the right way, they have the power to grow your stress tolerance and transform your relationship to adversity in all areas of your life.

“Wim Hof breathing and water immersion are two completely separate things. Safety first every time.”

— Jon Paul Crimi

Safety First: The One Combination That Can Kill You

Wim Hof breathing is a land-only practice. The pattern is 30 fast breaths in, 30 breaths out, then a long breath hold. It floods the body with oxygen, drives carbon dioxide down, and produces the lightheaded, tingly state Wim Hof is famous for. None of that belongs in cold water.

Hyperventilation-style breathing before submersion sets up a shallow-water blackout: your CO₂ alarm is suppressed, you do not feel the urge to breathe, you pass out, and you inhale water. Real people have died this way. Cold immersion alone is not what causes it. The breath pattern before the water is.

SAFETY: Never hold your breath in a cold plunge. Never do hyperventilation or circular breathwork in the water. No exceptions. If you want to train Wim Hof breathing, do it on dry land.

Once that one rule is locked in, the rest of cold plunge breathwork is calm, slow, and parasympathetic. That is what we will walk through next.

How Should You Breathe Before You Get In a Cold Plunge?

The single biggest mistake JP sees in beginners is that they wait until they are already in the water to start breathing. By then they are tense, frozen, and holding their breath. The plunge is over before they ever calm down.

The fix is to start breathing three to five breaths before your foot touches the water. JP calls it the Transformer Breath: in through the nose, out through the mouth, exhale twice as long as the inhale.

The kid-friendly cue, which works just as well for adults: smell the chocolate cake, blow out all the candles.

Stand next to the plunge. Three Transformer Breaths. Relax your shoulders. Drop your jaw. You are telling your nervous system, on purpose, that what is about to happen is not an emergency. Your nervous system believes whatever your breath tells it.

Stepping In: Exhale on the Hard Part

Now you keep breathing as you enter. Inhale. Step the first foot in. Exhale. Inhale. Step the second foot in. Exhale. Inhale. Sit down. Exhale to your neck.

Exhale on every hard part. It is the same principle as lifting weights – you exhale on the push. Exhaling activates the parasympathetic branch of your nervous system, the brake pedal. Inhaling does the opposite. Time the exhales to the moments your body wants to flinch and you take the flinch away from it.

If you want the next-level move, dunk your face. The mammalian dive reflex is an automatic vagus-nerve response built into your body: full-face cold contact calms the heart rate within seconds. It feels counterintuitive. You’d think a face full of cold water would spike your adrenaline. It doesn’t. It calms you down almost immediately.

One more cue: get to neck depth. Beginners often sit with the chest out of the water. The vagus nerve, sometimes called the wandering nerve, runs through the neck and chest. Submerging it is what triggers the deep calming effect cold plunging is famous for.

Why your body fights you: In a foundational 2000 study, sitting in 57°F water for one hour raised norepinephrine by roughly 530% and dopamine by roughly 250% (Šrámek et al., Eur J Appl Physiol). That surge is the reason every fiber wants you out. The breath is how you override it. [PubMed]

JP’s 3-Gear Breathwork System (While You’re In)

Once you are sitting at neck depth, your breath shifts gears the same way a car does. JP teaches three gears. Start in the lowest gear and shift up as your body calms.

Gear 1: The Physiological Sigh

For the first thirty to sixty seconds, your body is in shock. Use the physiological sigh: one inhale through the nose, a second quick snort of inhale on top of it, then a long exhale through the mouth. This is the fastest known way to discharge a stress response. Two or three sighs and the panic edge starts to drop.

Gear 2: The Transformer Breath

Once the initial shock is gone, slow it down. In through the nose. Out through the mouth, twice as long. Same pattern you used before stepping in. This is your middle gear. Use it for most of your plunge.

Gear 3: Nose Only

When you are fully calm – and you will know, because the cold stops feeling urgent – close the mouth entirely. In through the nose. Out through the nose. Slow, even, almost meditative. This is the gear you want to be in by the time you climb out.

If tension creeps back in at any point, shift up a gear. Drop from Gear 3 back to Gear 2. From Gear 2 back to Gear 1 if you have to. JP’s rule: listen to your body and adjust. The breath is feedback, not a script.

Why the parasympathetic effect is real: A 2025 meta-analysis of 11 randomized trials with 3,177 participants found cold-water immersion reduced 12-hour post-exposure stress by SMD −1.00 (Cain et al., PLoS ONE). The calming benefit is not anecdote – it is the largest pooled effect size yet measured. [PubMed]

What You Should Never Do in a Cold Plunge

Three rules, no exceptions.

Never hold your breath. Breath holds in cold water risk loss of consciousness. Hold your breath on land if you want to train it. Not here.
Never do circular or hyperventilation breathwork. It is a powerful practice. It does not belong in the tub.
Box breathing is optional, not universal. The classic 4-4-4-4 (in 4, hold 4, out 4, hold 4) works for some people. JP’s natural box is closer to 12. Some people are 8. If the count fights your body, stop forcing it and go back to the Transformer Breath.

How Cold Should a Beginner Cold Plunge Be?

The other beginner mistake is going too cold too fast. People crank the temperature to the lowest setting in the first week, try to stay in for ten or twenty minutes, and burn through their adaptation window in a month.

Treat it like the gym. If you walked into a gym after a year off and did six days a week for an hour, you would get short-term results and then plateau with nowhere to go. Same thing here.

JP’s prescription for new plungers:

Start around 50–51°F.
Stay in for 1 to 1.5 minutes the first few sessions.
Drop the temperature roughly 1°F per month.
Add 30 seconds at a time. Build to 3 minutes.
Past 3 minutes, returns diminish. Past 5, you start trading benefit for hypothermia risk.

The data backs the cautious approach: A 2025 network meta-analysis of 55 randomized trials (Cai et al., Frontiers in Physiology) found medium-temperature CWI – roughly 52–59°F for 10–15 minutes – produced the best recovery outcomes. Going below 50°F gave no additional benefit. The colder-is-better instinct is wrong for beginners. [PubMed]

Slower progression also gives you somewhere to go. Six months in, when you want to push, the cold is still cold. If you maxed out in week one, you have nothing left to strive for.

Why Your Plunge Matters: River Mode and Stainless Steel

Cold tolerance is individual. In a household with two adults, or a wellness facility with a hundred members, there is no single temperature that works for everyone. BlueCube’s River Mode solves that without changing the water temperature. Flip a switch and the moving water makes the same 50°F plunge feel 10 degrees colder.

Stainless steel matters too. JP pointed out that at identical temperatures, our BlueCube “bites more” than the acrylic plunge his neighbor owns. Steel conducts heat away from skin faster than plastic, so you get more therapeutic effect per degree. For commercial operators, the steel build also handles the volume – hundred-plus users a day, year after year – that plastic shells cannot.

“This is the Bentley of cold plunges.”

— Jon Paul Crimi

The Beginner Cold Plunge Protocol (10 Steps)

Set the water to 50–51°F.
Stand next to the plunge. Take 3 to 5 Transformer Breaths (nose in, mouth out, twice as long out).
Inhale. Exhale as the first foot enters. Inhale. Exhale as the second foot enters.
Sit down to neck depth. Submerge the vagus nerve.
Optional: dunk your face once to trigger the mammalian dive reflex.
Gear 1 – physiological sighs – for the first 30 to 60 seconds.
Gear 2 – Transformer Breath – for the middle stretch.
Gear 3 – nose in, nose out – once you are fully calm.
Stay in at least 1 minute. Work up to 3 over weeks. Stop there.
Drop the water temperature ~1°F per month. No breath holds. Ever.

Frequently Asked Questions

Is Wim Hof breathing safe in a cold plunge?

No. Wim Hof breathing and Wim Hof cold immersion are two separate practices. Doing the breath pattern before getting in can cause shallow-water blackout and has resulted in fatalities. Train Wim Hof breathing on land. Use slow, calming breath in the water.

How should a beginner breathe in a cold plunge?

Use the Transformer Breath: inhale through the nose, exhale through the mouth for twice as long. Start three to five breaths before you step in. Exhale on each step into the water. Once you are seated, work through JP’s three gears: physiological sigh, Transformer Breath, then nose-only.

How long should a beginner stay in a cold plunge?

One to one and a half minutes at 50–51°F is the right starting point. Build by 30-second increments over several weeks. Three minutes is the target for experienced plungers. Past three minutes, benefits diminish and hypothermia risk rises.

What is the mammalian dive reflex?

It is an automatic vagus-nerve response triggered when cold water hits the face. Heart rate slows, blood vessels constrict in the limbs, and the nervous system shifts into a calm state. Dunking your face for two seconds during a plunge can dramatically lower the sense of panic.

How cold should my cold plunge actually be?

Start at 50–51°F. Drop the temperature roughly 1°F per month as your body adapts. The research consensus is that medium-cold (52–59°F) for 10 to 15 minutes produces optimal recovery outcomes. As you build tolerance over time, going colder can be beneficial for mental and metabolic effects. The research on cold exposure is still in its infancy. Many experienced cold plungers do note benefits from going colder and longer when tolerance has been built. It is no different than lifting weights.

Take the Next Step

Ready to plunge with three-speed temperature control? Explore BlueCube plunges with River Mode

Want the full coaching session? Watch the JP Crimi video

Medical Disclaimer

This article is for educational purposes only and is not medical advice. Cold-water immersion carries real risks, including hypothermia, cardiovascular stress, and shallow-water blackout when combined with hyperventilation-style breathing. Consult a qualified physician before starting any cold-plunge protocol, especially if you have a heart condition, blood pressure issues, are pregnant, or have any other medical condition. Never plunge alone if you are new to the practice.