I have been doing ground work training a young TB/Perch cross gelding for a year now (he is almost two now). He started out very dangerous, wanting to rear all the time, running away for hours on end in the pasture (one time it took me over two hours to catch him in a little 3 acre pasture) and scared for anyone or anything to touch him. He has come a long way since then, and now he is generally very calm, easy to catch, and responds very well to pressure, especially laterally and backwards. However, he has what I know to be a dangerous habit of backing up whenever he gets scared, and if restrained, he goes up and strikes out. He has only gotten to the point of rearing when someone else was handling him (trying to help me, but it didn't really work); I don't let him get there. But whenever he feels unsure of something, even if it's not in fright, he just backs up and keeps backing. Also, despite the fact that we pay alot of attention to desensitizing to scary things, he is still very spooky and timid of trying new things; therefore, this backing problem comes up ALOT. I know that I need to find his "forward button" now, and teach him to stand still even when he is scared, instead of backing, so that he does not learn to resort to backing and rearing later on, under saddle.
I have tried just waiting with him when I start to feel him resist, until he relaxes and then asking again, but this rarely results in any progress, and sometimes when I let him think too long he decides he wants to back up anyway.
I have also tried just ignoring that he's backing and going along with him, rewarding him when he finally stops, so that he associates stopping with safety. This hasn't had any negative consequences so far, but doesn't seem to be getting us much closer to finding his "forward button" either.
Of course, he is still very young and awkward (his croup is nearly three inches higher than his withers), so perhaps once he evens out it will be more pleasant to move out? Another point I should mention is that he is very sensitive in that he gets confused and offended if I use too much force from behind (smacking with a crop or the end of the rope) to try to get him to move off. I have dealt with horses like that before, but not quite to his extent.
He is a very sensitive and smart horse, and very strong and well-built (once he catches up to himself of course) which makes me think he would eventually make a great dressage or jumping prospect, but I want to fix this problem now while he is young and get him thinking 'FORWARD!' more than 'backwards!!', and hopefully save myself from the rearing problem later on when I break him to saddle.
Any suggestions/thoughts would be wonderful! I am rather at a loss on what else to try with him.