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tarheel91 said:
hsrob said:
Ironman triathlon (4km swim, 180km on a bike and a marathon back to back). It doesn't require concentration in the same way that Formula 1 does, but the amount of mental toughness, not to mention physical conditioning required is astounding to me.

 

Ironically, Jenson Button, an F1 driver, participates in triathlons.

http://www.timesonline.co.uk/tol/life_and_style/health/traineao/exercise/article4032674.ece

Incidentally that's how Lance Armstrong started out, but Button only did a sissy little triathlon:P  When talking about the MOST demanding i'm only referring to Ironman Triathlon.

edit: but i have heard before about F1 drivers, Schumacher was supposed to be a machine and i know Mark Webber is into long distance adventure racing.