Quadrathlon, also known as quadriathlon or tetrathlon, is an endurance type sport which comprises of four disciplines. The four disciplines should be done at one time; the fastest who can do it is the winner. A quadrathlon consists of swimming, kayaking, cycling, and running.
- For sprint distance: 75 km swimming, 4km kayaking, 20km cycling, and 5km running. For short distance: 1.5km swimming, 8km kayaking, 40km cycling, and 10km running.
- For long distance: 4km swimming, 20km kayaking, 100km cycling, and 21km running.
There is a Quadrathlon World Cup that has been going on since 2001. It is organized by the World Quadrathlon Organization.
- Tetrathlon — composed of 4 out of the 5 disciplines of Modern Pentathlon: Swimming, Running, Shooting and either Fencing or Equestrian.
- Triathlon — a continuous event involving swimming, cycling, and running
- Aquabike — a shortened version of triathlon, with no running leg. Athletes swim followed by cycling.
- Aquathlon — a continuous race involving swimming followed by running
- Duathlon — similar to triathlon, running first, then cycling, then running again
- Modern Pentathlon — comprises five events: fencing, 200m swim, show jumping, and combined pistol shooting and 3200m run.
- See also swimming, kayaking, cycling, and running.