This is something I watched my trainer do while she practiced today- and it looked incredible from a spectators view! Line up cones in the center of your arena far enough apart to accommodate the length of your horse plus a bit more. Start at one end of the line and leg-yield through two cones, winding around the 3rd cone to leg-yield to the opposite angle, repeating the entire length. When at the end, circle and do it again. When I asked my trainer about the exercise, she said her horse wasnt quite moving and responding how she liked and doing the leg-yields helped his muscles loosen and engage properly. She was right, her horse absolutely moved better after! For me as a spectator, the exercise reminded me of a UFO hovering around the arena. Beautiful movement.