It will sound ridiculous, but I'd throw surfing on there. I've never tried any sport where I've tried as hard and not been able to get the rudimentary parts of the game down. Plus the fitness level needed to get out to even moderate sized waves is incredible. Throw in the danger of currents, sharp fins/boards and waves driving you into the sea floor/reef and I consider the guys that are good tough as nails and incredibly skilled. The effortlessness look of a pro hurts the tough angle, but anyone that's tried to ride a wave will be able to atest to what I'm talking about.
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