How do I get my stubborn ex racehorse to bend?

I started with stretches on the ground first with my horse to help loosen him up. Then under saddle I held my inside hand up and lowered my outside rein and tapped with my inside leg. You may have to over exaggerate this at first to help form the idea of what you want to do. Also just practice this on a circle I’m not the best at explaining things but I hope this helps
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