Kelli - there are 3 levels, so theoretically you do each one for about 10 days, depending on how you are doing with that level.
I'm going to do it today since the boys are grousing about going to the gym for the fourth day in a row and I need the cardio. The gym has had a bunch of free 'try this personalized class/training/workout' things this week and next week & I've been trying all of them
