hello
my horse lacks muscle in his back end. this is causing problems with his jumping. a few people have said that he is pushing off with his front end rather than his back ends which will lead to bad habits with his jumping. does anyone have any tips on how to build up this muscle? i can't afford a pessoa but i am saving up! any other ways?

A saddle change won't likely do much. You need to find a good Dressage trainer and work on your flat work. Flat work is what makes a good jumper .