Makes me think about a story a patient told me. I always ask if they read the directions and instructions....90% do not. And this patient had not. She used a ball as a chair on hardwood in stocking feet...okay, not recommended. Then as she was working, she decided to balance with one leg off the floor and her arms to the side when she was printing reports, then alternate legs...okay, not particularly a good idea in stocking feet. Then she got the bright idea that if that was good then balancing with both legs off the floor and both arms out to the side would be better.....NOT a good idea at all. One fractured tailbone and a compressed disc.