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Ironman is a triathlon consisting of a 2.4-mile swim, a 112-mile bicycle ride, and a 26.2-mile run. Chrissie Wellington is the reigning Ironman World Champion, having won the event four times in a row from 2007 to 2011. She is also the only woman to have broken the nine-hour barrier in the Ironman, with a time of 8:46:46 in 2009.