Well, my APH mare does fine at a very slow training pace. She has cow hocks and an intense rushed training under her girth, which started hurting her at 11yo last year. With a bunch of treatments for her, from stretching to MSM, she's smoother than even before her hocks started bothering her. I have to work Dressage into her exercise variety, elsewise she would kill her forehand and have a stiff shoulder. IMO, as long as the horse is improving over time in relaxation and balance, should be acceptable.