This might sound like a product endorsement, and I suppose it is, but there are lots of ways to improve your balance, and this is only one of them: The Bosu. A

This might sound like a product endorsement, and I suppose it is, but there are lots of ways to improve your balance, and this is only one of them: The Bosu. A physical trainer showed it to me. When you first get on it, you'll panic and probably fall off. But I found I improved pretty rapidly, and now I routinely stand on one leg and rotate side to side. If you have a friend who also has one, you can throw the heavy ball back and forth to each other. Big fun. Do it on a soft surface so if you do fall you won't get hurt. Most likely, though, if you feel you're about to fall you'll probably just step off.