HotbearLVR - 2014-07-01 6:47 PM In my case, I think it was my riding. My horse is too good and too experienced and too healthy to do that on his own accord, seriously. I think I was anticipating and not keeping squared up, as far as body position. Also, sometimes I went to the horn early and maybe asked for rate too early. I think once that happened a time or two, I wound up with a viscious cycle, and attempts to "correct" it (ie: reining off, etc...) would up getting him stiff and pushing back.....once that cycle starts it almost becomes habit. When you have to start correcting for your mistakes, you end up losing focus and time. I would recommend watching several videos and looking very critically at your own riding just as much as looking for soreness and lameness. You can spend a fortune looking for lameness.....in my case, the lameness was between my ears. I applaud your asking for opinions.