Biggest Loser Kinect Game

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I have the Biggest Loser game for Xbox Kinect. I like the game & feel good about the workouts & yoga I'm doing by using it as a guide. The only problem is I don't know how to figure the calories I'm burning? The game totals seem quite low. Does anyone know how accurate they are? Is there anything here on MFP that would be equal to it? I don't know how to enter my exercise here.