The document provides information about equestrian dressage, including its origins, rules, equipment, and some of the top representatives in the sport. It discusses how dressage originated as a method for training military horses and evolved into an artistic discipline focused on developing a horse's natural abilities through harmony with its rider. The document also outlines the basic rules for dressage competitions and equipment requirements. It briefly profiles four top dressage riders: Charlotte Dujardin, Edward Gal, Hiroshi Hoketsu, and Arnaud Boiteau.