Nykeem meets up with Tai-Lee and her horse pal Gerald to explore the science behind dressage, which has been called "horse ballet." Biomechanics is key. The horse and rider must be in tune with each other as they use their muscles to move, to control movement, and to impress a judge. Dressage has roots in the training of cavalry horses in preparation for battle. Pro Olivia demonstrates some of the classic moves in dressage including passage, a half pass, and aa piaffe.  Biomechanics is the study of how humans and animals move; it is important to understand how a rider's movements affect the horse.