Control Horse is a job that involves controlling the movements of a horse. The term 'REIN' is used to refer to the straps or lines used to control the horse. The reins are held by the rider and used to direct the horse's movements. The rider can use the reins to slow down, speed up, turn, or stop the horse. Control Horse is an important job in the equestrian world as it requires skill and knowledge to ensure the safety of both the horse and the rider.