This is an issue I've had for quite a while, but didn't notice it until finally at a clinic, the trainer told me my jumping position is bad. Approaching the fence, I have a really good position; shoulders back, elbows bent, strong in the back...blah blah. But over the jump, I either get too round, or "stand up", or do something that isn't pretty. When I'm warming up during a lesson my trainer has me walk/trot/canter in my two-point and then it is perfect. But I can't maintain that position over the jump. Suggestions anyone?