The document profiles several famous athletes who competed in the 2012 London Olympics, including: 1) Jelena Issinbajeva, a Russian pole vaulter who is a two-time Olympic gold medalist and five-time world champion. 2) Usain Bolt, a Jamaican sprinter who is a three-time Olympic gold medalist and world record holder in the 100m, 200m and 4x100m relay. 3) Michael Phelps, an American swimmer who owns 16 Olympic gold medals.