Can fitness be obtained by playing an Xbox 360 Kinect game?

Well this new commercial (via @WinRumors) certainly alludes to that and I guess the reality is if you get active, no matter how you do it, then you will become more fit.

Your Shape Fitness Evolved is available from for a discounted price of $39.99 which is $10 off normal retail.

I might have to try this out myself.