Heat & Cold

Sauna Bathing · Finnish & Infrared Heat

The strongest human longevity signal for any heat protocol comes from one Finnish town followed for two decades.

Passive heat therapySaunas are sold as general wellness products and are not FDA-cleared to treat, prevent, or cure any disease. No medical device clearance underwrites the heart-health or longevity claims marketed by manufacturers.

Cold Water Immersion · Ice Baths & Plunge Tubs

Real recovery and mood signals, but skip the ice bath right after lifting if muscle is your goal.

Thermal recovery practiceNot an FDA-regulated medical treatment. Cold plunge tubs and chillers are sold as general wellness or recreational products, not cleared devices, and carry no approved disease claims.