Kerron Stephon Clement is a Trinidadian-born American track and field athlete who competes in the 400-meter hurdles and 400-meter sprint. He held the indoor world record in the 400-meter sprint, having broken Michael Johnson's mark in 2005.
Clement at the 2016 Summer Olympics
Clement at the 2007 World Championships
Clement at the 2010 Bislett Games
The 400 metres hurdles is a track and field hurdling event. The event has been on the Olympic athletics programme since 1900 for men and since 1984 for women.
Women's 400m hurdles
Géo André jumps over a barrier during the 400 metres hurdles in 1922