Jordyn Wieber

Jordyn Wieber competes in the floor exercise during the 2009 Tyson American Cup at the Sears Centre on Feb. 21, 2009, in Hoffman Estates, Ill. Wieber, who celebrated her 17th birthday July 12, 2012, had her sights set on the Olympics since she was a girl.

Special section: The 2012 London Games

Credit: Jonathan Daniel/Getty Images