Horse walker

A horse walker is like a big circle that a horse can walk in to get exercise. It has fences all the way around so the horse can't run away. A person puts the horse inside and then turns on the machine. The machine turns the circle around and around slowly, and the horse walks along with it. The horse gets some exercise without having to be ridden by a person. It's like going for a walk on a treadmill, but for horses!