Help with a basic: posting
So, since I've started riding, posting with stirrups has always been the hardest thing for me. I sit horses easily enough (and have been complimented often on my seat) but things go out the window when I post with stirrups. Take off my stirrups, and I can easily post (and sit, but that's not the problem).
Ever since I've got my new horse, my posting has gone down the drain. Part of it is that I'm still a little chicken and haven't ridden without stirrups with him, which usually kept me in check... But it's really beginning to affect my horse.
Problems are really in turning his shoulder. They are very stiff, especially going to the left. I know it's me. I've had a few people look at him and they're all pretty convinced it's a mental block of his. (and he's good in terms of chiro) So he has his thing and I'm not helping.
But then, if I sit him (which I don't like to do since he's still developing a topline), it's totally different. I barely have to use reins at all, he turns on a dime, uses his back beautifully and starts to swing. It's a huge difference and the thing that changes is whether I sit or not.
As I'm still searching for the right coach, I've been on my own these last few weeks... what can I do to help me with my posting? What exactly could I be doing wrong that it's so dramatic? I know that I learn forward a bit when I post, could that be enough for such a huge change?