The "Wagon Wheel" horse-training exercise. Not only will this help make your horse more supple and calm, but I think it would be a good way to get your horse to slow down too. Really make them think about what they're doing with their feet.
Turn Your Phone Into a Projector. Get an old shoe box cut a hole put a magnifying glass in it put your phone however close or far you want to make the picture on the wall big or small And watch whatever movie you want ;