From Citizendium, the Citizens' Compendium
A triathlon is a three part sporting event of swimming, biking and running. The four main types of triathlon are sprint, classic/olympic, half-ironman, and ironman.
The length (in kilometers) of each leg of each type of triathlon are as follows:
- "Beginner's guide to triathlon," BBC Sport, 4/16/04, accessed 8/17/08 <http://news.bbc.co.uk/sport2/hi/olympics_2004/triathlon/sport_guide/default.stm>