Ok so first some background, I have an OTTB who is 10 yrs old. He is a great mover and great horse. However, I have just started his undersaddle training and he has had several 'melt downs'. Heres what he does, he will go in a circle pick a spot in the circle and throw his hanches to whatever direction he wants to go. If you put leg on he either doesnt respond or blows up. At first we thought it was gate sour, but he does this in every circle and just picks a spot and the completely shuts down. Doesnt respond, wont move, nothing after SEVERAL attempts by my proffessional trainer on his back he still couldnt get past it. He would go fine, and then pick a spot and throw his haunches and nothing would get him going, she would have to spin him until he was ready to go. Even young two year olds get after a while it is easier to do what they are asked then to fight, he would NOT quit fighting. Also when we were done he does this head bobbing thing that we assume is from the track, however today we tied his tongue and the second it was tied he relaxed and almost fell asleep. Once it was off back to head bobbing. Could this be some neurological problem from tongue tying? Any supliments I could give? I have tried ground training and everything and not even my proffessional trainer who has 20+ years competing and training could help.