For some extreme athletes, daredevil feats are the only reason for getting out of bed in the morning. Among the most daring: Reinhold Messner, who climbed Mount Everest without oxygen twice in three years; Martin Strel, who swam the entire length of the world's longest rivers fueled in part by wine; and Lewis Gordon Pugh, who likes to swim in Antarctic waters infested with leopard seals while wearing only a Speedo.

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