Trot, trot, trot! A horse uses his hind end significantly more at the trot than the canter ot slow gallop. Ground poles help if your horse is well broke and sensible, place them far enough apart that he has to reach under himself.
I couldn't agree with you more Amanda! Trot trot trot and trot some more. Be sure your footing is ideal...not to hard and not too deep...deep footing cant be very hard on a horse...especially one who is young and not well adjusted yet.