Video game creators have a new controller -- you.
The phenomenon started four years ago when Nintendo released the Wii console, which uses hand controllers and your movement to control the game. This winter has seen others invade the market, with the Playstation Move and the Xbox Kinect.
Wii Fit, released in 2008, introduced the idea that fitness and video games could coexist. Now the studies have started trickling in -- and the news is not as promising.