I count RockBand as exercise. I exercised for 2 hours yesterday on RockBand. I believe I can count it because a) I really get to wailing on the guitar and drums, and 2) I work up a sweat. I think that even if you are just singing, you can count it IF you dance around like a fool. And so I support advertisement of RockBand (1, 2 and 3) as a piece of your exercise regimen.