THE SCIENCE IS UNAMBIGUOUS
Elite athletes have used cold water immersion for decades. Here's what the research actually says — and how to use it to compound your performance, recovery, and mental edge.
WHY COLD THERAPY WORKS
THE BIOLOGY OF COLD EXPOSURE
When your body enters cold water, a cascade of physiological responses begins within seconds. Blood vessels constrict, drawing blood toward your core. Your nervous system activates. Stress hormones — specifically norepinephrine — surge by up to 300%. This isn't discomfort for its own sake. It's a controlled hormetic stressor: a brief, intense stimulus that makes your body more resilient, more efficient, and more capable of managing real-world stress. The benefits compound with regular practice.
Reduce Stress
Cold exposure is believed to activate the sympathetic nervous system and increase the release of certain neurotransmitters, such as norepinephrine, which can have a mood enhancing effect.
Improved Sleep
Cold therapy may positively impact sleep by promoting relaxation and reducing muscle tension. Improved sleep quality can have numerous mental health benefits, including better mood regulation, increased focus, and overall cognitive function.
Pain Relief
Cold water immersion provide pain relief benefits by reducing inflammation, numbing pain receptors, and releasing endorphins as a natural pain reliever.
Improved Circulation
Cold water immersion increase circulation by forcing blood to flow to vital organs and increasing the rate at which waste products are removed from the body.
Increased Energy
The shock of cold water activates the sympathetic nervous system, which increases heart rate, blood flow, and oxygenation, leading to a surge in energy.
Accelerated Recovery
Cold temperatures help reduce inflammation and muscle soreness, which speeds up recovery time after intense workouts or activities.
Improved Immunity
Cold water immersion helps stimulate the immune system, helping to increase the production of white blood cells and promote better overall health.
Improved Mood
Some individuals report feeling a sense of invigoration and improved mood after taking ice baths. Cold exposure is thought to stimulate the release of endorphins, the body’s natural mood enhancers. Endorphins can contribute to a sense of well-being and act as natural painkillers.
Enhanced Mental Clarity
Cold water immersion also helps increase dopamine levels and reduces stress levels. It also increases alertness and focus, leading to better mental clarity and performance.
Mental Toughness & Resilience
Regular exposure to uncomfortable or challenging situations, such as cold water immersion, may contribute to the development of mental toughness and resilience. Overcoming the initial discomfort of an ice bath could translate into improved mental fortitude in other areas of life.
EVIDENCE-BASED PROTOCOLS
HOW TO USE YOUR DUNK
The research is clear: frequency and consistency matter more than extreme temperatures. These protocols are designed for real-world application — not extreme cold sport.
BEGINNER FRIEDLY
MORNING ACTIVATION
Start the day with a cognitive edge
The most widely recommended protocol. A morning cold immersion activates the sympathetic nervous system, triggers a norepinephrine surge, and creates a sharp mental state that carries through the first half of your day. Best done before breakfast.
10-15'C
TEMPERATURE
2-5min
DURATION
5x/week
FREQUENCY
ATHLETIC
POST-TRAINING RECOVERY
Reduced soreness, restore capacity
Immerse within 30 minutes of completing intense training. Cold reduces acute inflammation, clears metabolic waste from muscle tissue, and begins the repair cascade. Used by Springbok players and elite gym athletes.
8-12'C
TEMPERATURE
5-10min
DURATION
3x/week
FREQUENCY
SLEEP FOCUS
EVENING WIND-DOWN
Optimise sleep quality
A 90-minute pre-sleep cold immersion drops core temperature — signalling the brain to initiate deeper sleep stages. Combine with the natural dopamine rise from cold exposure for a powerful wind-down ritual.
14-18'C
TEMPERATURE
3-5min
DURATION
90min
FREQUENCY
TEMPERATURE REFERENCE
FINDING YOUR OPTIMAL RANGE
EXTREME COLD
3–8°C
Maximum vasoconstriction. Intense physiological response. Used by advanced practitioners and competitive athletes for acute injury or peak performance preparation.
Experienced practitioners only
PERFORMANCE COLD
8-14°C
The sweet spot for post-training recovery. Strong enough to trigger the full cascade of benefits — manageable enough to sustain for 5–10 minutes consistently.
Athletes & regular practitioners
MODERATE COLD
14–20°C
Ideal for beginners and morning activation protocols. Significant benefits with lower intensity stress response. Best for building a consistent daily practice.
Beginners & daily practice
HOT THERAPY
38–42°C
Muscle relaxation, improved flexibility, enhanced circulation. Used in contrast therapy cycles or standalone for recovery and stress relief. Dunk 3.0 exclusive.
Contrast therapy & warm-up
Work Volume & Strength Training Responses to Resistive Exercise Improve with Periodic Heat Extraction from the Palm
Palm cooling between sets of high-intensity resistive exercise delays fatigue onset and enhances training response, aiding performance optimization.
Impact of Cold-Water Immersion Compared with Passive Recovery
Study aims to assess Cold Water Immersion's impact on athletic recovery, including performance, perception, and creatine kinase levels post-exercise.
COMMON QUESTION
THE QUESTIONS WE HEAR MOST
Straight answers on the things most people want to know before committing to a cold therapy practice — or a Dunk purchase.
Do I need to add ice to the dunk ?
What is the Dunk warranty ?
How often should I change the filter ?
Should I keep The Dunk inside or outside ?
What is the appropriate height for choosing an XL size
Is it possible to connect a chiller to the inflatables?
How often can you do an ice bath ?
How long should I soak in an ice bath for recovery ?
Are ice baths just for athletes?
What are the health benefits of ice baths?
Should I take an ice bath before or after a workout?
Should I shower after an ice bath?
It’s important to note that while ice baths may offer several health benefits, they may not be suitable for everyone, particularly those with certain medical conditions. It’s always best to consult with a healthcare professional before trying ice baths or any new form of therapy.