OK, so my gelding has recently decided that our arena is the root of all things evil. If I'm riding him he wont even go near the gate or even the arena for that matter without bucking, and as I'm just as stubborn as he is this has ended with me choking down a mouthful of dirt more than once. However this only happens when he isn't being lead into the arena, if someone has a hold of his bridle he is 100% fine. He doesn't have a fear of gates either. My trainer think it's just that he doesn't want to exercise, but when I lead him in to the same arena to lunge him he's a perfect angel. What the heck!!
How the heck do I fix this??