Ride-The Ride phase of competition provides an opportunity for the rider and mount to demonstrate equestrian skills over a predefined course. Courses are designed as Stadium, Cross Country, or a combination, where the course incorporates Stadium fixtures as well as natural terrain.

Run-The Run phase of competition challenges each competitor's physical stamina and endurance. The course is designed over cross country terrain and may include obstacles that must be negotiated, such as hay bales, logs, low event fences, etc.

Shoot-The shoot phase of competition tests a competitor's skill, in a standing position, using an air pistol on a 10 meter course. Any type of compressed air or CO2 pistol is permitted which does not exceed the specifications outlined in the Tetrathlon Rule Book.

Swim-The swim phase of competition allows competitors to demonstrate their swimming skills over a pre-defined course length, measured in either meters or yards.