Wim Hof first caught the attention of scientists when the proved he was able to stay submerged in ice for one hour and 53 minutes without his core body temperature changing. Since then, he's climbed Mount Everest in his shorts, resisted altitude sickness, and completed a marathon in the Namibian Desert with no water. Almost everything Wim has done was previously thought to be impossible, but he's not a freak of nature; he's a master of meditation.