(i ride english)When I canter my horse, I usually do it on half of the arena, and is I very nice and relaxed on it..like a rocking horse. When I go from the circle to the whole arena, he gets fast and usually breaks into a trot. He also speeds up on the straight. I am going to be in a show in mid febuary and was wondering how could I help him canter a full arena like he canters the half arena. I need him relaxed and smooth on the full arena.