70.3 Triathlon is a half Ironman also known as a middle distance triathlon.
The 70.3 distance is 1.2 mile swim (1.9km) 56 mile cycle (90km) and half marathon 13.1 miles (21.1km).
This is a stepping stone event from an Olympic distance triathlon to half the ironman distance to prepare people for the 140.6 miles (226.27km) Ironman (2.4 mile swim 112 mile cycle 26.2 mile marathon)
Qualifying races are held around the world and the final takes place in November in Clearwater Florida.