A dressage competitor is a RIDER who competes in the equestrian sport of dressage. Dressage is a form of riding that focuses on the horse's obedience and responsiveness to its RIDER, and is often compared to a type of ballet for horses. Riders must demonstrate their horse's ability to perform a series of predetermined movements, such as circles, half-circles, and serpentines. Competitors are judged on the accuracy and precision of their horse's movements, as well as the harmony between the horse and RIDER.