Dancing with the Stars is a good example of what you can do with your body if you put your mind to it. But it’s also becoming an example of just how fragile your body is. The contestants on the show have been getting injured so badly that they implemented a new rule where contestants can only practice a maximum of five hours per day. (Only. Five hours is quite a lot if you’re not in the best shape.)The contestants they have chosen are of all different fitness levels. Just...