Three day eventing is an international sport which is based on the versatility of horse and rider. The first phase is dressage. A horse and rider must perform a series of movements where accuracy and obedience are rewarded. The test must be ridden from memory and error points are given for errors in the movements. Points are rewarded for fluid, precise, and balanced movements.

The second phase is cross-country. This tests a horse's athletic ability, speed, and endurance. Horse and rider must gallop over a course constructed of solid obstacles, which the horse has never seen before. These courses can be between four to five miles and contain 20 jumps or more. Refusals at a fence, falls, and time faults are penalties. A competitor must be in top physical condition in order to complete the course. It is a true test of confidence between horse and rider.

The final phase is show jumping. A course is set containing between 12 to 14 fences. Penalty points are given for a refusal, knocking down of a fence, and seconds over the optimum time. This tests a horse's fitness after completing a cross country course.