What are the best protocols for cold exposure?

Use brief, challenging cold exposure, and tailor the timing and rewarming to your goal.

• 1. Start gradually: Begin with about 30 seconds to 3 minutes at roughly 40–45°F, adjusting to what feels safely uncomfortable and building up as you adapt. Cold exposure should feel challenging, not extreme. 1
• 2. For muscle growth: If maximizing strength or hypertrophy is the goal, wait at least 4 hours after training before cold-water immersion; immediate cold immersion may blunt adaptation. After high-intensity exercise, cold exposure can help reduce soreness and improve perceived recovery. 2 3
• 3. For metabolic effects: Follow the Søberg principle: finish with cold rather than immediately reheating, allowing the body to rewarm itself. Brief cold–rewarming cycles can help bring on shivering; don’t stay in cold water until you become hypothermic. 4 5
• 4. Choose an accessible method: Cold showers, plunges, and natural cold water are options. For the metabolic approach described here, the aim is to induce shivering; one example is alternating brief cold exposure with time out of the cold, without drying off between rounds. 6 7

Keep exposure safe and avoid pushing through warning signs of excessive cold.