The very first triathlon was in California in 1974. The Olympic committee announced that the triathlon would become an Olympic event in 2000. Triathlons have three parts swimming, cycling, and running, and they happen one right after the other. To be in the triathlon you need a swimming suit, a pair of swimming goggles, a bicycle helmet, a bicycle and a pair of running shoes and a running vest. Some athletes also wear a wetsuit and cycling shoes.The Olympics triathlon is a distance triathlon. The athletes swim for about one mile, cycle for about 25 miles, and then run for about six miles.