One particular extension of human design is devoted to that most leisurely of pursuits, video gaming. The NaturalPoint TrackIR 5 allows gamers to control the action simply by moving their head.
Look at your computer. Now look at me.
This virtual reality head mouse uses an infrared sensor and reflective material attached to your head via the track clip accessory. Using its unique 6 degrees of freedom vector technology, the TrackIR is then able to control the game without use of additional devices. The sensitivity is also adjustable for a customized experience.
The TrackIR 5 bills itself as the #1 selling simulation head tracking device, and is compatible with many different games.
So when it comes to your free time, use your head.