About This Practice

Extended cold exposure at 2-5°C for 5-10 minutes. For experienced practitioners. Listen to your body.

How to Practice

Prepare a tub or plunge at 2-5°C. Get in deliberately — enter feet first, then slowly submerge up to the neck. Do not jump in. Once submerged, focus entirely on slow nasal breathing. The cold shock response (gasping, rapid breathing) peaks in the first 30-60 seconds and passes if you breathe through it. Do not move around — movement displaces the thermal boundary layer and makes the cold feel sharper. Stay submerged for 5-10 minutes. Exit deliberately before you stop shivering; do not chase duration at the expense of safe exit. Warm up naturally — movement, warm drink, dry clothes. Avoid a hot shower immediately after; let the body rewarm itself for 20 minutes first for the full metabolic benefit.

Tips

Nose breathing the entire time. Mouth breathing amplifies the panic response.
Do not move around in the water. Stillness is warmer.
Exit before you feel forced to — safe exit is non-negotiable at these temperatures.
Natural rewarming (20 minutes without hot shower) maximises brown fat activation.
Not a competition. Five minutes at 3°C does more than 10 minutes at 10°C.

Precautions

Advanced practice only. Requires months of build-up through beginner and intermediate protocols.
Absolutely contraindicated with cardiovascular disease, uncontrolled hypertension, arrhythmias, or Raynaud's.
Never practice alone at these temperatures and durations.
If shivering stops and you feel warm or sleepy in the water, exit immediately — this is early hypothermia.