I saw a video once where LP and PP where invited to ride with people on other disciplines like dressage in a clinic with a great European trainer who's point was, in this clinic, that it doesn't matter what discipline you ride in you ride the same. I was so disappointed in LP she was stiff, had horrible riding position, you could tell the horse was agitated with her and she refused to take instruction. You could tell that every time the clinician asked her to do something different she got more angry at being told to do something. I will openly admit to being annoyed by her.
"It's a lot like nuts and bolts - if the rider's nuts, the horse bolts!" ~Nicholas Evans