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The sauna, properly: infrared vs traditional, and the small details nobody mentions
Sweden practically invented the sauna habit, so we take it seriously. Traditional Finnish saunas heat the air to roughly 80 to 100°C; infrared cabins run cooler and warm you directly. Both have a following. The honest answer is that the bulk of the long-term population research, including the well-known Finnish studies, is on the traditional hot, dry sauna, so that is where the evidence is deepest.
Protect your hair. Dry heat is hard on hair. A wool sauna hat (a Nordic staple) keeps your head and hair cooler and more comfortable.
Cool down with intent. The contrast matters. A cool shower or fresh air between rounds is part of the ritual, not an afterthought.
Timing for women. Heat tolerance can shift across the menstrual cycle; many find gentler sessions sit better at some phases. Listen to your body rather than a fixed rule.
The Bryan Johnson take. The longevity-obsessed founder runs a hot, dry sauna near 90°C for around 20 minutes, several times a week, an enthusiast's version of the same protocol the population studies describe.
