Allyson Michelle Felix (born November 18, 1985) is an American track and field sprint athlete who competes in the 100 meters, 200 meters and 400 meters. At 200 meters, she is the 2012 Olympic champion, a 3-time World champion (2005–09), and 2-time Olympic silver medalist (2004–08). In 2015, she became World champion at 400 meters. She has won three additional Olympic gold medals as a member of the United States' women's relay teams; two at 4 x 400 meters (2008–12) and one as part of the 2012 world-record 4 x 100 meters team.Felix's 200 meters best of 21.69 secs from 2012, ranks her sixth on the all-time list. In 2013, she broke the world best for the rarely contested 150 meters distance, running 16.36 secs. In the 4 x 400 metres relay at the 2015 World Championships, she ran the fastest split ever recorded by an American woman, and third fastest split ever after Jarmila Kratochvilova and Marita Koch, with 47.72.As a participant in the US Anti-Doping Agency's "Project Believe" program, Felix is regularly tested to ensure that her body is free of performance-enhancing drugs. She is coached by Bobby Kersee.