I'm sure by now you have heard of " Wii", the new interactive way to play games such as tennis. The premise is simple: using a sophisticated attachment on the body, a person simulates movements in a sport or other activity and the TV screen displays the results.
If you are using the tennis module, you use your hand to simulate the action of the racket against an imaginary ball. The computer shows how your arm motion actually worked in a game format. The Wii commercials are everywhere with the holidays upon us so you'll be certain to see an example of how it works if you haven't already.