400 metres hurdles 400 metres hurdles 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. On a standard outdoor track, 400 metres is the length of the inside lane, once around the stadium. Runners stay in their lanes the entire way after starting out of the blocks and must clear ten hurdles that are evenly spaced around the track. The hurdles are positioned and weighted so that they fall forward if bumped into with sufficient force, to prevent injury to the runners. Although
United States at the 2013 World Championships in Athletics Jennifer Simpson (1500m), Lashinda Demus (400m hurdles), and Brittney Reese (long jump) on the women's team. 2012 Diamond League champions Charonda Williams (200m), Dawn Harper (100m hurdles), Chaunte Lowe (high jump) and Reese Hoffa (shot put) were also automatic qualifiers to the team. World record holder Aries Merritt was also a Diamond League champion in 2012, but a country is only allowed one bye into the championships. The bye into the 110m hurdles was already taken by Jason Richardson, so Merritt had to qualify by placing in the championships. Decathlon Heptathlon United States at other World Championships in 2013 United