Wim Hof, “the Iceman,” practices cold exposure in order to accomplish incredible feats: climbing Mount Kilimanjaro in shorts, for example. He also holds the world record for a barefoot half marathon above the Arctic Circle, and standing in an ice cube-covered container for more than 112 minutes. 

Reporter Scott Carney’s investigative and participatory journalism book, What Doesn’t Kill Us, delves into Hof's methods, and explores how far humans have strayed from our evolutionary roots and the implications that has on our health. "The developed world—and, for that matter, much of the developing world—no longer suffers from diseases of deficiency," he told Spine. "Instead we get the diseases of excess.”