These videos demonstrate the hand exercise balls you can use and how they work. Each has their own way of exercising your hands to keep them healthy and fit.
This videos demonstrates the Handmaster exercise ball. It exercises the hands by resisting your fingers when stretching and squeezing.
A very cool demonstration of using Baoding Balls (chinese exercise balls). This person is very good at using them as you can see the coordination and dexterity he has built up over the years.