Its a little arbitrary to say what is the hardest sport. I would not like to run against the Chicago Bears defense or get towed into a 30 ft. wave at Peahi or Mavericks. I wouldn't be interested in swimming the English Channel or to Catalina from San Pedro. Climbing Everest or K2, no thanks. You would have a pretty good chance of surviving gymnastics or swimming or figure skating, but most of us would be in serious trouble with the Bears, Peahi, Everest, etc.
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