I just found out today at my riding lesson that I have REALLY tight hips. Which have been effecting my riding dramatically. The horse I ride named William is so well trained he does everything you ask him to do. So when I've been riding him I've been really tight through my hips and when I ask him to canter all I do is make him speed up at the trot and eventually he goes at a near gallop because I then tense up more because he is going so fast. My riding instructor has said I should start doing hip stretches because she couldn't even get her hand between the saddle and my thigh. Any stretches anyone knows of that might help?