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400m is a common track running distance. On a standard outdoor running track, it is exactly once around the track in the inside lane. This is the longest distance that is usually run in lanes all the way round. A successful runner will need an efficient stride and superior speed, and a small amount of non-fast twitch muscles to be competitive. For career 400m runners this becomes a prolonged high speed sprint.
The current men's world record holder is Michael Johnson, in 43.18 seconds. The reigning Olympic champions are Jeremy Wariner and Tonique Williams-Darling.
Famous 400m runners
Men
Women
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