Jamaica's Usain Bolt celebrates winning his third gold medal after the final for the men's 4x100-meter relay during the athletics competitions in the National Stadium at the Beijing 2008 Olympics. (Greg Baker/AP Photo)
London 2012: the men's 100m, medals and Mo – in pictures
Allyson Felix Team USA’s Allyson Felix is the only woman to be a three-time Athletics World Championship gold medalist. She was nicknamed “Chicken Legs” in high school, but her now perfectly built muscular body is far from that.