My horse has gotten into the habit of backing up everytime I put any leg on her while she is stopped. When I ask her to turn on her hauches she starts to back up, even when I try to get her to side pass she starts to back up. Lately I have been backing her into a corner and asking her to do things which makes it impossible for her to back up at all, and she'll do all that I ask her to, but when I take her out of the corner again she continues to back up. IDEAS>?!?!?!