My friend and I take hunter jumper lessons together, and she had a quetion for me that I didn't know exactly what to tell her. We both ride thoroughbreds, me on speckles and her on doodles. When doodles jumps, he does so with all four feet, either that or he just flies through them not even paying attention to his form, etc. our instrutor tells her she needs to get him to roll back, but everything she's tried doesnt work. Does anyone have any tips I could give her?