Kinect PlayFit tracks the calories you burn while playing Kinect games. Whatever Kinect game you decide to play (for me, it's either Dance Central or Your Shape: Fitness Evolved), Kinect PlayFit will track all your stats, and will place you amongst others on the Xbox Live members leaderboard. Not only does it allow you to compete for high scores, but achievements and avatar awards can also be unlocked.
Many sniff at the thought of exercising via a console, but honestly guys, it works. I managed to lose three stone in a year from a combination of Wii Fit, Dance Central, Your Shape: Fitness Evolved and eating healthier. Don't knock it until you've tried it!
