From Citizendium - Reading time: 1 min
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:
| Swim | Bike | Run | |
|---|---|---|---|
| Sprint | 750K | 20K | 5K |
| Classic/Olympic | 1.5K | 40K | 10K |
| Half-Ironman | 1.9K | 90K | 21K |
| Ironman | 3.8K | 180K | 42.2K |