Tetrathlon is a four-phase competition requiring practical horsemanship and general athletic ability involving running, riding, swimming and shooting.
- Riding phase: Juniors ride a cross country course with obstacles at a maximum height of 90cm which Seniors ride a course with a maximum height of 1.05m.
- Running phase: The senior boys run over a 3,000 metre course while senior girls and all juniors run over a 1,500 metre course and each competitor’s time is measured.
- Swimming phase: The senior boys swim for 4 minutes, senior girls and juniors swim for 3 minutes.
- Shooting Phase: Senior boys and girls shoot using an air pistol of .177 calibre at 10m. air pistol targets from the standing position. Junior boys and girls shoot using an air rifle of .177 calibre at 10m. air rifle target lying in a prone position.
Teams shall consist of 3 or 4 members only one of whom may be over 21 years but under 23 years on 1st January of the current year. A Senior is a member who has attained their 15th birthday on the 1st January.
Teams shall consist of 3 or 4 members. A Junior is a member who has not yet attained his or her 15th birthday on 1st January. It is recommended that the bottom age limit in the Junior Championships is 12 years.
Scores from all four phases are added together to arrive at an individual score for each member. The best three individual scores are calculated to arrive at a team score.
All competitors in the Senior and Junior Championships must have passed their C Test.