Not sure what Kinect PlayFit is? Well shame on you firstly, and secondly, let me explain.
Kinect PlayFit is a dashboard for the Xbox 360 that's centered around (you guessed it) fitness. As you play games such as Dance Central 2 and Your Shape Fitness Evolved 2012, the fitness dashboard keeps tracks of the calories you've burned.
It also shows your 'Daily Streak', the amount of 'Community Calories', and has leaderboards and social "activity challenges".