What you do next is bring the food down towards the ground
. This is when the horse does the bow position, as he will follow where the food goes. When his head goes all the way down, say bow as the cue word, and then give him a treat. Then let him get up again and bribe him with another treat. When he bows down together with your cue word, reward him once again. Do this repeatedly until such time he bows down without a treat and only your cure word. Your cue word must be strong and clear. You can continue giving him treats there after. How to train a horse to bow is that simple.