With origins in France, the sport has spread through Europe, and was introduced to the UK by the British Horse Society (BHS) in 1998.
The complexity of the navigating and challenge of the terrain also increases at higher level competitions, demanding greater skill.
Penalties can be deducted in a number of ways including: The MA phase is designed to demonstrate that a rider has a high degree of control over the horse, first in canter and then in walk.
The PTV is a series of obstacles, designed to test the obedience, confidence, courage and balance of the horse and the correctness of the rider's aids.
The obstacles are formalisations of things that may be encountered on a ride in an unfamiliar location and may include jumps, ditches, water, steps and dismounted tasks.
Pairs ride the POR together and then complete the MA and PTV separately, and their scores are added together to determine the final placings.
Several variations of TREC exist, catering for riders new to the sport, wishing to concentrate on particular aspects or different times of the year.