I was at riding, and my instructor video taped us. In my video, I saw my back is really really arched, but it feels straight when I'm riding. My instructor told me to roll my back, tighten my lower stomach muscles, and loosen my shoulders. When I did all this, other problems were uncovered. I was riding a horse with a bumpy canter, and I have to crouch down in the saddle, and I have to lift my hands off the horses neck. When I did all this, I lean forward, even though I don't mean to, and I get really unbalanced, and I focus on myself too much. The horse I was riding refused the jump. How do I not arch my back, and not have too much to think about, and sit in the saddle, and lift my hands of his neck, and not lean forward and, and, and, and......... ugh, so hard. I will try to get a video or pic or something. Thanks to all who help!!!