What are the best protocols for cold exposure?

The best cold-exposure protocol depends on your goal: start with an uncomfortable but safe exposure, build up gradually, and use cold immersion or a shower according to what you can access. 1

1. Resilience and alertness: Use deliberate cold exposure that feels uncomfortable enough to make you want to get out, but that you can remain in safely. Begin with a tolerable shower or immersion and gradually increase the challenge rather than starting with extreme cold. 2 3

2. Thermogenesis: Follow the Søberg principle: finish with cold, then rewarm naturally rather than going straight into a hot shower or sauna. For metabolism, aim to reach shivering if it remains safe; shivering is associated with succinate release and brown-fat thermogenesis. 4

3. Post-exercise recovery: For substantial soreness or pain when faster recovery is a priority, Galpin described cold-water immersion as preferable to a cold shower. His suggested ranges were very cold water for about five minutes or 40–50°F water for more than 15 minutes; ease into cold and stay safe. 5

4. Fat loss: Use cold exposure that induces shivering, alternating cold with brief periods out of the water or shower without drying off. One described starting protocol is three rounds: enter until shivering begins, spend about 1–3 minutes out, then return for 1–3 minutes. 6

5. Safety and comfort: Cold tolerance varies, so choose a level that is challenging but safe, and increase exposure gradually. Avoid jumping into extremely cold water without adaptation; the guidance emphasizes not risking hypothermia or cold shock. 7 8