The Way of the Iceman by Wim Hof
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A little nuance here: Wim Hof is a (mostly) serious athlete who has demonstrably done some amazing things involving cold tolerance and suppression of immune response. This stuff is documented/recorded with doctors present, its pretty verifiable. His techniques appear to be at least partially teachable, as he's trained other people to do similar things, so its not just a question of him being a freak of nature. However, he seems to have no coherent idea about why any of it works and advances a lot of semi-incoherent and inconsistent theories. Worse yet, his co-author in this book (who is in reality the principal author) is a complete fruitcake who advances any number of really spurious ideas about how Hof's method works (mor spurious than the one's Hof himself suggests), and also adds in a number of pseudo-scientific new age practices that don't really seem related to Hof's method (and which Hof doesn't really talk about in interviews). The back half of the book contains some summaries of actual science done on Hof and folks he's trained, but it's hard to know how reliably the findings have been digested.
So this book is kind of hot garbage, except for the practical discussion of Hof's breathing and cold training techniques (which have been shown to have some provable efficacy, whatever the real reason). Here's a sentence I've never said before: You'd probably be better off watching some of his youtube videos rather than reading this book.