Ironman Training - You Can Too!... An Ironman Triathlon consists of a 3.9 km swim, 180 km bike and 42.2 km marathon run. This Triathlon is one of a series of long-distance triathlon races organised by the World Triathlon Corporation (WTC) . The Ironman Triathlon, or The Ironman Triathlon World Championships, is both the original triathlon and the annual world championships of the event, took place once a year since 1978 in Hawai’i. It was made prominent...