Citizen Athlete Project - Wim Hof claims to be no special human. In fact, he has an identical twin brother who does not practice any of these techniques and cannot (at will)
WIM HOF - VICE
Weatherwatch: Extremely cool Iceman keeps his inner fire burning at -27C | Human biology | The Guardian
Heat Comes From Within! Mastering Cold - Wim Hof, "The Iceman" #67 — Daniel Vitalis
Watch The Iceman Vice Documentary | Wim Hof Method