Just read this... Kind of made me laugh because I tend to lean while playing games..
"Microsoft demoed a FPS game that took advantage of Kinect in a completely natural game-playing way. Your hands are on the controller. Your thumbs are on the analog sticks. Your fingers are on the triggers. Oh crap, a giant rocket is coming right at you on your screen. You move your thumbs accordingly, you subconsciously lean to the side with it, the rocket passes by. Phew. You're okay. You didn't even realize it but you just controlled a game with Kinect and you didn't die. Hmm?"