Then, during the 2004 Games, the ex-Cirque performer won gold on the parallel bars.

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He performed in all six disciplines but he struggled on the parallel bars and admitted he still had pain in the hand.

BBC: Injured Hamm forced to withdraw

But it amazes him that those young women can do what they do on the balance beam and the parallel bars and the vault.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Press Secretary Mike McCurry said that Clinton, shortly after boarding Air Force One, began a physical therapy session, including special parallel bars that had been brought aboard the aircraft.

CNN: Clinton, Yeltsin Meet In Finland

The system was introduced after last year's Olympics when America's Paul Hamm was awarded the all-round title after South Korea's Yang Tae-young was incorrectly docked a 10th of a point from his parallel bars routine.

BBC: World Gymnastics highlights