When you ask the horse to back up under saddle, he tucks his head in, locks his feet up, and won’t move. What should you do?
You basically have two choices. Since the horse has lost all the energy in his feet, you could pull one rein (without actually releasing the pressure) and yield his hindquarters again, which would provide the energy you need to redirect him backwards. Or you could continue to apply pressure up by his elbows, alternating your legs, as you hold light steady pressure with the reins until he finds the answer by taking one step backwards. If it seems like the pressure you’re applying is not enough to motivate him to look for another answer, you may have to increase the pressure by tapping his elbows with your spurs.