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How to train a horse to jump
Make sure you have the required items.
You'll need cavaletti poles, jump standards, boots to protect your horse's pasterns, and a suitable saddle for jumping. If you don't have a cavaletti just use wood poles or tree branches.
Use heavier weight poles (not pvc pipes or bamboo) so if your horse hits one of the poles he will realize that hitting them is uncomfortable. Set the cavaletti poles on the ground.