Biathle is a sub-sport of modern pentathlon consisting of running and freestyle swimming.
It is a sport in its own right and bears close resemblance to aquathlon which also contains swimming and running but comes from triathlon.
The race length is usually 200 m swim and 3 km run, which is shorter than aquathlon usually is.
Competitions are held under rules of the Union Internationale de Pentathlon Moderne (UIPM).
The Biathle World Championships have been held in September or October annually since 1999.