I've just been jumping my horse over cross rails, but he tends to overjump them a lot. He doesn't seem nervous or anything, he's jumped a lot before at his old home, but I just can't seem to get a clean approach.
What size crossrails? I'd be starting nice and low.. 40cm, with a pole on the ground a stride before to help him get his striding into the fence. Only when he is jumping them nice and calmly, would you raise it.
Are you trotting or cantering into the jumps? If he is not forwards enough, they tend to overjump more.