Horse racing tests the speed of a horse. Different breeds do different types of races. The most popular type in the U.S. is Thoroughbred racing, where only horses of this breed can participate in galloping around a track. There are also endurance races, trotting races and steeplechases (horses galloping around a track with jumps). Most horses that are used for racing are ridden by professional riders called jockeys. Usually the people that own or train the horse do not ride it in the races.