I haven't played the game but from what I heard you have to work out but the game also provides some missions which you must complete. Instead of being in like a peaceful area, you are in the jungle or something crazy like that and apparently you even go into some trap-filled tombs. Sadly, I've heard that the game itself isn't too good. Apparently it has trouble reading the moves with Kinect so it can become frustrating as it asks you to repeat moves constantly.
That is what I have heard from people that have played it, though!