Wow, I haven't seen it all explained this way before. "Secure-seat: Improving your horse riding training"
An update on PATCHES and a few interesting charts... - Horse and Man
I didn't read all that I just like the demonstration of which is wrong and right... the top is the best but it's better to be too far back than forward.
The Amazing Horse Hoof-Think Like a Horse-Rick Gore Horsemanship ®
When choosing your horse, this is invaluable information.
Front Leg Conformation