Get Fit With Mel B

I got this legit, but strangely although it popped up I think I was in the middle of an exercise so never saw it until I logged into True Achievements! I was trying to do a regular 30 minutes a day but have cut to 15 mins on some, so it is possible to do two weeks and just 15 minutes if you want. I think it only works by picking Today's Workout. I suppose you can cheat and change the date and time on your XBox but that would need confirmation.