Interesting about that rubber ball as I do the same thing outside on my patio, and it drives my neighbor nuts. However, if is a very good way to relieve stress, and also exercise at the same time, especially my non-dominant hand. My former doctor, now a friend has also been involved in a study involving dancing and joy. I dance around my apartment quite often, and since reading Rita Moreno's story in Brain Life magazine, I even pretend I am conducting some times, as she does now after losing her ability to dance. For anyone looking for a good read, Brain Life magazine is a free publication. Just go online and subscribe and I think the magazine is published bi-monthly. Very good and articles on a variety of issues.