Google is introducing "Gmail Motion" -- that let you can control Gmail with your body.
How it works?
Gmail Motion uses your computer's built-in webcam and Google's patented spatial tracking technology to detect your movements and translate them into meaningful characters and commands. Movements are designed to be simple and intuitive for people of all skill levels.
Familiarize yourself with some of the basic functionality of Gmail Motion using this printable guide of sample gestures. With it, you'll be able to start writing and responding to emails -- with your body -- in no time.
Using Gmail Motion isn't only safe but also healthy and fun. As with any physical activity, certain precautions are recommended. First, make sure to clear the area around you. Second, try to take short breaks every 30-40 minutes, just as you would if you were typing. And finally, take time to stretch after each session to give the muscles you'll be using some relief.
More Info: Sign Up Gmail Motion Beta