400 metres

The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440-yard dash (402.336 m)—which is a quarter of a mile (1,760 yards) and was referred to as the "quarter-mile"—instead of the 400 m (437.445 yards), though this distance is now obsolete. The current men's world record and Olympic record is held by Wayde van Niekerk of South Africa; his time of 43.03 seconds is the fastest ever run in an open 400 m. While Lythe Pillay holds the fastest 400 m relay split with a time of 42.66, relay splits are typically faster because athletes have a running start and do not need to react to the gun if they are not the leadoff leg. Considering van Niekerk's reaction time of 0.181 seconds in his run of 43.03, van Niekerk covered the 400-metre distance itself in 42.85 seconds, therefore being 0.19 seconds slower than Pillay's relay split. Quincy Hall is the reigning men's Olympic champion. Collen Kebinatshipi is the current men's world champion. Kerron Clement is the men's world indoor record holder with a time of 44.57 seconds. The current women's world record is held by Marita Koch, with a time of 47.60 seconds. Sydney McLaughlin-Levrone is the current women's world champion, holding the championship record of 47.78 seconds. Marileidy Paulino is the women's Olympic champion, and holds the Olympic record in a time of 48.17 seconds. Femke Bol holds the women's world indoor record at 49.17 (2024). The...