If not golf, then...
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unicycle( Carlos Chavez, Los Angeles Times )
You are probably wondering what kind of brain disorder prompts someone to ride down a mountain trail on a unicycle. We wondered the same thing. As if riding on two wheels down a steep, rock-strewn trail isnt hard enough, these guys try to make mountain biking even more challenging by riding a unicycle.
With an arm out and a hand on the grip, Eyal Aharoni of Santa Barbara rides down. "If you're not really coordinated, don't unicycle," he advises.