I bought an 11 year old quarter horse who has an issue with backing up. We bought him as a rope prospect but he needs to be able to back up and he rears up if you try to back him up a few steps. I can get him to back up 2 or 3 steps anything after that he’s in the air or throwing his head. I’m open for any suggestions. I’m planning on working with him but I’m looking for some advice. Thanks