A Challenged Athlete Foundation (CAF) urbanathlete scaled an 8-foot wall obstacle during the Men's Health Urbanathlon, Sunday, Nov. 18, 2012 in San Francisco. The Men's Health Urbanathlon is a rigorous 9 mile course, packed with challenging urban obstacles set against the backdrop of iconic city landmarks. (Photo by Tony Avelar/Invision for Men's Health/AP Images)

Associated Press
A Challenged Athlete Foundation (CAF) urbanathlete scaled an 8-foot wall obstacle during the Men's Health Urbanathlon, Sunday, Nov. 18, 2012 in San Francisco. The Men's Health Urbanathlon is a rigorous 9 mile course, packed with challenging urban obstacles set against the backdrop of iconic city landmarks. (Photo by Tony Avelar/Invision for Men's Health/AP Images)
A Challenged Athlete Foundation (CAF) urbanathlete scaled an 8-foot wall obstacle during the Men's Health Urbanathlon, Sunday, Nov. 18, 2012 in San Francisco. The Men's Health Urbanathlon is a rigorous 9 mile course, packed with challenging urban obstacles set against the backdrop of iconic city landmarks. (Photo by Tony Avelar/Invision for Men's Health/AP Images)
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