Instructions
Have your horse thoroughly evaluated by a veterinarian for any physical problems that could be causing its weak hind-end. Leg and lameness problems may cause a horse to avoid using its rear-end in order to escape pain. Attempting to build rear-end strength on a horse like this without first treating any medical problems could cause it unnecessary pain and exacerbate the health problems.
Work your horse at the trot. Trot work can often improve hind end strength and is beneficial for general athletic conditioning as well. Add an additional 5 to 10 minutes of trotting work to your regular riding work outs to improve conditioning.
Ride up and down hills at the walk and trot. Your horse will get the most athletic benefit from trotting up hills and then walking back down. Do not allow your horse to go too fast up or down hill, as it will not get as much benefit from the exercise. Start hill work gradually and steadily build up your horse's endurance.
How to Build Up the Rear End of a Barrel Horse
The way a horse moves and the muscles it uses to propel itself can affect its performance in events such as barrel racing. Barrel racing is a speed event that requires the horse to propel itself and its rider around three barrels in a clover-leaf shaped pattern as fast as possible. A barrel horse with a weak hind-end is not getting the propulsion it needs to reach its best speed and scores; instead, it is dragging itself around the barrels using power from the front end. A more balanced build will improve the horse's athleticism and times in competition.