Originally Posted by churumbeque
I saw a Julie Goodnight special where she used a bat (crop) when the horse wouldn't move off leg she quickly and sharply swatted him in the barrel. Not on the rump. If on the rump they might buck or kick. This method was very effective and the horse learned quickly to move off when lightly asked.
I've been taught that the whip or crop is there to reinforce leg requests and therefore it is to be applied in the same location where your leg is making the request.
Since I can't reach a horse's rump with my leg, I don't apply the stick there. I apply it to the barrel right by my leg and I do it along with the leg aid if my leg alone is being ignored.