My 6 year old son needs to move, even when he needs to sit still to write. This was a dilemma for us for a while, until his speech & language therapist suggested simultaneous core stimulation. I bought him a Pilates exercise ball, and replaced his usual hard & stationary kitchen chair with this soft, round & moveable object. Not only does he get to move his bottom half while his top half does his work, he gets to develop his core muscles and balancing skills at the same time. This really has helped keep him on track, which is a huge success in our book!