I started this workout plan today (Week 1 Day 1). The strength part was challenging and the cardio was moderate. I think I'll do the cardio tomorrow on the elliptical to make it possible for me to go at a faster pace without hurting my knees. I ended up adding another jogging interval and stayed on the treadmill for 5 extra minutes today. I probably should go measure to see if I see a change in two weeks like it promises :).