I developed this exercise with a friend who also rides dressage. To do this, walk/trot/canter down centerline (Enter at C). Leg yield to the left (wall with E) as far as you can get, but don't go past S. When you reach S, halt and do a turn on the haunches to the right, so your horse is parallel to the wall C is on. If your horse understands pirouette, simply just do one, don't halt. Then leg yield towards C, but when you hit centerline, don't go past it! Turn on the haunches or pirouette to the right again, so you horse is parallel to the wall with B on it. Leg yield as far as you can, but don't go past P. Turn on the haunches or pirouette and leg yield to A, but don't go past centerline. Turn on the haunches or pirouette and repeat. 😁 If your horse is advanced, you can do half pass instead of leg yield. This is extremely good for suppling your horse while working on three different essential components! Leg yields/half pass, haunch turns/pirouettes, and transitions. Jumpers will also benefit from this because it will improve the ratability and rideability of their horse.