give me a protocol for combined protocol

Combine 11 minutes of cold exposure and 57 minutes of heat exposure per week. Split cold across 2–3 sessions and heat across about 3 sessions; these are weekly totals, not targets for a single session. 1 2

• Cold: Aim for roughly 1–3 minutes per session in uncomfortably cold but safe water, building up gradually rather than pushing into unsafe conditions. 3 4
• Heat: A practical target is about 20 minutes per session, for three sessions weekly. Sauna is discussed at 80–100°C (176–212°F); heat exposure should be uncomfortable but safe. 5 6
• Contrast option: Alternate about 20 minutes of heat with about 5 minutes of cold. One example uses 3–5 rounds; build tolerance gradually and keep both temperatures safe. 7 8

You can do the weekly routine on one day or spread it across multiple days; avoid treating the weekly totals as a requirement to complete in one sitting. 9