Breyer Traditional National Reining Horse 50th Anniversary Edition. Formed in 1966 to promote the reining horse, the NRHA has become a dynamic organization that has set the standard for the sport of reining worldwide! Reining is an exciting sport with roots on the ranch. Horse and rider pairs that compete in NRHA reining events run a pattern that is designed to show off the athletic ability of a ranch-type horse within a show arena. These patterns include both slow and fast circles, roll backs, spins, flying lead changes, and the crowd-favorite: sliding stops!