Ice bath
Chest-deep in water with ice — a strong cold stimulus that needs preparation, company and clear limits.
Execution
- Fill a tub or barrel with cold water and add ice; 10 to 15 °C is plenty to start with.
- Get in slowly — legs first, then hips, finally up to the chest; keep your hands out at first.
- Breathe deliberately through the first minute — long exhales, no breath-holding and no hyperventilating.
- Start with 30 to 60 seconds and only build up once your breathing settles quickly after getting in.
- Get out at the latest when shivering, numbness or confusion set in.
- Afterwards dry off, warm clothes, a warm drink, light movement — warm up gradually.
Tips
- A thermometer is part of the kit; "feels cold" is no measure of the load.
- In Movepath, log only your time in the water, not preparation and warming up.
- Never alone: a second person should be within reach and keep an eye on you.
What makes an ice bath
In an ice bath you sit chest-deep in water cooled down with ice — somewhere between about 3 and 15 °C depending on how much ice you use. Unlike a cold shower, the water surrounds most of the body at once, and water draws heat from the body many times faster than air at the same temperature. That makes the ice bath a much stronger stimulus. It does not belong at the start of cold training but follows a few weeks of cold showers.
What research shows — and what it does not
Cold-water immersion has long been used in sport for recovery. Meta-analyses show a small to moderate effect on muscle soreness in the days after hard exercise, most likely at around 11 to 15 °C for 11 to 15 minutes. At the same time, a study by Roberts et al. (2015) showed that regular cold-water immersion straight after strength training reduced gains in muscle mass and strength over several weeks. If building muscle is your goal, the ice bath therefore does not belong directly after your strength session.
Cold also raises noradrenaline levels considerably, which explains the alertness and the high many people report afterwards. There is currently no solid evidence for broader health claims such as boosting immunity, weight loss or treating depression — most studies are small, short and lack a control group.
Progression
- Prerequisite: several weeks of cold showers until two minutes feel relaxed.
- Start: 12 to 15 °C, 30 to 60 seconds, once or twice a week.
- Build up: add 30 seconds every one to two weeks, up to about three to five minutes.
- Only then go colder: lower the temperature in small steps — never increase time and cold at once.
As a precaution, stay well under ten minutes in very cold water. This is caution, not a study result: every minute raises the risk of hypothermia, and the recovery studies mostly used milder water at 11 to 15 °C.
Safety
- Not medical advice. With heart or circulation conditions, heart rhythm disorders, high blood pressure, Raynaud's syndrome, epilepsy, cold urticaria or during pregnancy, check with a doctor first.
- Take cold shock seriously. In the first minute heart rate, blood pressure and breathing rate shoot up. That is the most dangerous moment — get in slowly, never head first.
- Never alone, never with alcohol. Alcohol dilates the blood vessels and clouds judgement — especially your sense of when it is time to get out.
- No breathing exercises in the water. Hyperventilating or holding your breath before or during the bath can make you pass out.
- Get out if you shiver uncontrollably, your hands go numb, or you feel dizzy or confused.
- Mind the afterdrop: core temperature keeps falling for a few minutes after you get out. Warm up gradually — warm clothes, movement, a warm drink — not straight into a hot shower or the sauna.