A fitness guru who goes by ‘Iceman’ says exposure to extreme temperatures is a lifesaving third pillar of physical health

Wim Hof is an extreme athlete from the Netherlands who holds dozens of world records for activities like swimming in ice water and running barefoot in the snow. The self-described “Iceman” promotes a fitness regimen that includes cold water plunges and a special breathing procedure. The scientific evidence behind his cold-exposure technique is still limited, but a few studies suggest it works.

The “Iceman” was 17 when he first dove, unclothed, into the

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