Cold plunges / How to
How to cold plunge safely
A simple protocol for beginners, how to progress, and how to pair it with your sauna.
Start warmer than you think
Begin at 55-60°F. You'll still get the full shock response. Work down toward 45-50°F over several weeks if you want to. Most of the benefit comes from the contrast, not from the absolute temperature.
Keep it short
30-60 seconds the first few times. Build toward 2-3 minutes. There's no evidence that longer than 5 minutes adds anything, and the risk of hypothermia rises.
Enter slowly and control your breathing
Don't jump. Step in, sit down to the shoulders, and breathe out long and slow through the gasp reflex. The urge to hyperventilate passes in about 30 seconds.
Never alone
Have someone nearby, especially at first. Cold-shock fainting is rare but real, and a fainting episode in water is how people drown.
Warm up naturally afterward
Towel off, put on layers, move around. You'll keep cooling for 10-20 minutes after you get out (the "afterdrop"); that's normal. Avoid a hot shower immediately after, which can cause dizziness.
Pair it with the sauna
The classic cycle: 10-15 minutes sauna, 1-3 minutes cold, 5-10 minutes rest at room temperature, repeated two or three times. End on cold if you want to feel alert, on warm if you're heading to bed.
Time it around training
Cold right after lifting may reduce muscle growth. Plunge before training, several hours after, or on rest days if building muscle is the goal. After endurance sessions, timing matters less.
Keep the water clean
Shower before plunging. Run the filter, keep ozone or UV on, and change water on the schedule your tub recommends. Cloudy or slimy water means it's overdue.
Who should check with a doctor first
Anyone with a heart condition, high or low blood pressure, Raynaud's, a history of fainting, or who is pregnant. Cold is a stressor; make sure your body is ready for it.
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