So I've been leasing my horse KC for just about 2 months now (since May 31) and we're having a bit of an issue. When I started leasing him he was absolutely horrible. He was pretty much uncontrollable in even a kimberwick, wouldn't relax, stayed hollow, refused jumps, threw people off, bashed peoples face in, and had the worst, unsittable, unbalenced canter I have ever ridden. Now after almost two months of constant dressage and flatwork, I have him in an augarian baucher bit, he is perfectly controllable at all gaits, keeps his head at his poll and his nose on the vertical, is relaxed, AND works from his hind end. Stadium jumping, well that's a bit different (ps I do eventing with him, not showing YET though). He just tenses up, goes hollow, throws his head up and charges at the jump (even from trot). He is perfectly fine with trot and canter poles and goes over them like they are nothing. Im pretty sure its not just the site of a 'scary' jump because he does this even with teeny cross rails and he works total controllable dressage quality on cross country where we go over plenty of scary jumps like water jumps, ditches, banks, tires, etc. And also he doesnt always do this for stadium jumping, sometimes he is completly relaxed and working well like he does on x country and dressage, BUT only on rare ocassions. We have mainly been working on bringing him in to the jump as controlled, and relaxed as possible and bringing him to a stop on the other side of the jump which has helped. For the head throwing we had a properly adjusted running martingale on him (adjusted by a olympic eventer) which he was still able to hit me with, and we had on a german martingale that wasn't restrictive but still should have come into play before he hit me but he still did. Finally we decided to go against all the eventer rules and we got a standing martingale for him which works amazingly :) we have it properly adjusted so it doesnt restrict him but comes into play when he throws his head.
So, sorry for the really long explanation thing but what I'm basically wondering is what exercises do you know that would help him calm down for jumping?