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It sounds like the perfect pastime for anyone obsessed with staying young who also happens to enjoy a little light masochism. "Extreme cryotherapy" is like an anti-sauna: You enter a chamber that's chilled to 216 degrees below freezing, which is "nearly 100 degrees colder than the lowest natural temperature ever recorded on Earth." Immediately, as ABC reporter Nick Watt discovers, you feel like your heart is "about to explode.... mixed with a strange euphoria." While remaining in the chamber longer than two minutes will quite possibly kill you, if you do survive, your skin ought to look a bit younger, which is obviously totally worth the risk of sudden organ failure.