Hi! I've been having some troubles when I'm cantering with my gelding. He likes to try and take off with me when we're cantering. I've tried cantering him in small circles at one end of the arena, I have tried not using the crop, I've tried just about everything. Even when I canter him on the lunge line, he bucks and kicks out. Penn hadn't been cantered with his previous owner but he was fine the first few times when I cantered him. Any tips on how to control him?