Years and years ago this was a Saturday morning mainstay for my sister & me. .. we'd do the step aerobics, skip the power circuits (cuz Leg Day was Sunday) and then do the Upper Body & Core sections. I've done the UB in the past few years when needing a short UB workout, but not the rest. Yesterday I did the step aerobics & power circuits ... whoo! The power circuits are kinda "I- MAX-ish" with simpler step choreography & one leg exercise (endurance based so quite a few reps) attached to each cycle. It was fun for a change of pace ( of course I modified to lower impact). It's been fun & interesting doing some of these older workouts.