I need some advice on getting my Thoroughbred to calm down and stay on the bit while doing a course. Anytime we start running through a jumping course he gets so excited, throws his head up, and rushes the fence. His flat work is beautiful, its just while we are jumping that it gets messy. As soon as he catches sight of another jump I can feel myself losing connection. His back caves down, his hind legs go out from under me, and his head goes up. The only thing that seems to help is circling him before the jump to get him calmed down again, and it helps. But, as you can imagine, I cant be doing that before every jump in a course. I've had him and all our tack checked with my vet and trainer and they say nothing is hurting him. I use a running martingale for a bit more contact, but it hardly seems to help. Any help is appreciated! Thank you!