\i have been reschooling a horse, he has been going very well, but I cannot get him to really, really use his back end. he is ready to do this, is soft, flexible, has great balance, can do the basics of lateral movement and woeks nicely on the bit, but when you ask him to engage a little more, he finds it hard.
I have been trying with plenty of transitions, and been trying to help him develop more muscle, but am stuck right now. I have not had this with any other horse. He just needs to engage his hocks that bit more to help carry a little more weight on the back end.