We bought a Kinect for our Xbox 360 a few weeks ago. I have been sore in areas I didn't even know I had muscles. For those of you who don't know what the Kinect is, here's a snippet from xbox.com:
You are the controller. No gadgets, no gizmos, just you!
Kinect brings games and entertainment to life in extraordinary new ways without using a controller. Imagine controlling movies and music with the wave of a hand or the sound of your voice. With Kinect, technology evaporates, letting the natural magic in all of us shine.
After giving it your all jumping around, swatting at balls, dodging obstacles, etc, it shows these instant replays and folks, if you know what's smart for you, you'll turn them off. It's like when you hear your recorded voice and can't fathom you actually sound that way. Secretly you maintain that your voice really sounds the way you hear it in your head. It's kinda like that. The video shows you flailing about for no apparent reason. Picture a fish flopping about out of water except it's seal sized, pink, and has four protruding limbs to enhance the effect.
Yep, that about sums it up. Kinect is awesome, but will give you sore muscles and bruise your ego.