Thanks so much for the advice BrightEyes. Your advice sounds right on the money to me. Yes, have been practicing one-rein with him, and he does already know the maneuver, from previous training. I will practice this weekend with him using the running martingale. See how he does, and only use that on the trail. Though he is young, he has a lot of trail hours behind him, and does know "the drill" on the trail. I have been concerned, b/c every thing I Read says use GM for training only. Yet my trainer uses it on her horses most of the time, but she doesn't trail-ride. Thanks so much; I will practice my one-rein stop, nd also try the running mg.