A test of both endurance and athletic versatility, the Olympic triathlon requires competitors to excel at three very different and demanding disciplines: swimming, cycling and running. Olympic triathletes swim 1500m, bike 40km and run 10,000m. Men and women compete seperately.
In London, triathlon will take place in Hyde Park, where 3,000 spectators will enjoy a grandstand view of the finishing area, with many thousands more able to watch as the athletes swim, cycle and run on the course.