I don't think you'd call it a trick but there's benefit to teaching your horse, no lead or halter, to stand and not move while you circle it, first with a hand touching and gradually farther and farther away until you have a huge circle. After the first circle whereby she doesn't move, give her a treat. Eventually you will leave your treats outside the fence and she will learn to wait while you fetch one. One that benefits her is to hold a carrot between her lower legs and have her stretch for it, the on both sides in the cinch area then as high as you can reach. This will loosen any tension in her neck.