The 400 metres, or 400 metre dash, is a common sprinting event in Track and Field competitions. It has been featured in the athleticsprogramme at the Summer Olympics since 1896 (1964 for women). On a standard outdoor running track, it is exactly 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) - also referred to as the 'quarter-mile' - instead of the 400 m, though this distance is now obsolete. An athlete who competes in the 400 m may still be referred to as 'quarter-miler'.
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