Your body's relationship with heat goes way deeper than a good sauna session — it might be the key to longevity, emotional bonding, and even what made us human in the first place. ⁠Bill Gifford⁠ makes the case for heat as a fitness tool, while ⁠Hans Rocha IJzerman⁠ reveals how our inner thermostat shaped everything from our relationships to our evolution — two books that together redefine what warmth really does for us.

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