This exercise is great for balance, suppleness and rythm. Place the midle pole on the line E-B in dressage arena and then two more poles 11m from the middle one on both sides. Ride the centerline from A to C crossing the poles in the middle and ride 10m circles when You are crossing the poles. Try first this exercise in walk, then in trot and with more experienced horses - in canter with flying changes after the circles. Have fun🤗