What is Cold-Plunging?

Cold-plunging is a practice in which the body — fully or partially — is submerged in very cold water for a short period of time. The water typically ranges between 13°C to 3°C, and immersion lasts about 2 minutes, up to a maximum of 8 minutes (depending on the tolerance and experience of the user)

Maybe you’re thinking: why would anyone willingly jump into freezing water? Are they insane? Nope — not at all. This practice has countless physical and mental benefits. Some of the most recognized include:

• Reduces cortisol (stress hormone) levels. 

• Strengthens the immune system.

• Anti-inflammatory effect. 

• Improves blood circulation. 

• Enhances sleep quality.

Now let’s look into the key benefits for athletes.

Benefits of Cold Exposure for Sports Performance

Although cold-plunging isn’t only for athletes — anyone can improve their well-being with this practice — athletes tend to be early adopters.

Anti-inflammatory effect

Intense exercise creates microscopic tears in muscle fibers. The body responds with inflammation, which initiates the healing and regeneration process. Inflammation can also arise from poor stretching or impact injuries.

Exposure to cold temperatures activates anti-inflammatory processes that reduce swelling and relieve pain.

Cold immersion also triggers initial vasoconstriction followed by vasodilation. This reduces blood flow to affected areas and helps minimize inflammation.

Faster muscle recovery

Cold-plunging shortens muscle recovery time after intense exercise and reduces delayed-onset muscle soreness (DOMS).

Cold slows blood flow temporarily, and once the body returns to normal temperature, circulation increases rapidly. This improved blood flow brings oxygen and nutrients to damaged muscles faster, speeding up repair.

Energy boost

Cold exposure is a powerful way to activate the body and increase energy. Here’s why:

• It activates the sympathetic nervous system, increasing alertness

• It stimulates the release of dopamine, norepinephrine, and noradrenaline — key for focus, mood, and energy

• Cold increases blood flow, improving oxygen and nutrient delivery

• Cold exposure encourages deeper and faster breathing, boosting oxygen intake and respiration

Stress relief and mental resilience

Every athlete knows the psychological demands of sport — stress, anxiety, pressure. Cold-plunging helps here, too.

• As internal temperature drops, hormones and neurotransmitters like endorphins, dopamine, serotonin, norepinephrine, and oxytocin are released, promoting calm and reducing stress.

• It acts as a “controlled stressor,” activating genetic pathways that help us manage real-world stress (Mental Health Center of America).

• Repeated cold exposure trains the body to handle stress better long-term — both in cold water and in life

A Closer Look: Muscle Recovery & HRV

There’s a fine line between pushing your limits and overtraining. When the line is crossed, progress stalls and injuries show up.

Luckily, the body has a built-in way to signal when it needs recovery: the autonomic nervous system. It has two branches: 

• Sympathetic system: raises heart rate and blood pressure (fight-or-flight)

• Parasympathetic system: slows things down, promotes rest and recovery (powered mainly by the vagus nerve)

Elite athletes — and even soldiers— can shift quickly between high-adrenaline states and deep calm. This ability is a superpower for performance and recovery.

One way to measure this adaptability is Heart Rate Variability (HRV).

When we inhale, heart rate speeds up; when we exhale, it slows down. The greater the variation, the better the nervous system is functioning.

• High HRV: good recovery, good readiness, strong adaptability

• Low HRV: poor recovery, low energy, system under stress

Low HRV day after day means the body isn’t adapting well — often due to lack of sleep, high stress, poor exercise habits, or high blood glucose.

So what does cold exposure have to do with HRV? Cold immersion has strong potential to increase HRV and boost recovery.

Professional rugby player Marcos Moneta explains:

“Since I started cold-plunging daily, my HRV has been rising consistently. It went way up.”

Timing matters

Timing your ice baths correctly depends on your goals and training style. Should you do it before or after working out? It depends.

Goal: Recover Faster & Feel 100%

We recommend you do cold immersion after training. This reduces soreness, speeds recovery, and provides a surge of energy.

Ideal after: high-intensity workouts, matches, long runs, tournaments, heavy training days.

Goal: Build Muscle (Hypertrophy)

This is where timing flips. Cold immersion after heavy lifting can slow muscle growth by interfering with the body’s repair process.

So, if your goal is hypertrophy: take a cold-plunge before training so you don’t interfere with the body’s mechanisms of muscle growth. Also, wait 6-8 hours after training before doing cold immersion. 

A pre-workout cold plunge can also increase flexibility, range of motion, blood and oxygen flow, and give you that extra energy boost.

Final Thoughts

Cold exposure supercharges athletic performance.

And you don’t need to be a professional athlete to feel the benefits. Cold-plunging can dramatically upgrade your quality of life.

(*) Disclaimer: Always consult your doctor — especially if you have heart issues or high blood pressure — before starting cold exposure.