This exercise is brilliant for improving balance on the centre line as well as making the rider aware of how accurately they're riding. I enjoy doing this exercise in the slower paces, with my young horses, as they enjoy the change of rein, keeping it a bit more interesting for them. With my more experienced horse, I'll do this exercise in canter and throw in the occasional walk-canter-walk transition, to keep him collected, and may even ask for the bend in counter canter or pop in a simple change at X