- Triathlons have roughly a half-million participants each year
- The sport has been organized only since the 1970s
- An Ironman triathlon is a 2.4-mile swim, 112-mile ride and 26.2-mile run
Cambridge, Maryland (CNN)Swim, bike and run. In that order. And that's basically it. The deceptively simple idea for the popular sport of triathlon is built upon a triple challenge that pushes one's body and mental perseverance to reach beyond a single discipline.