Hi Cathe, This is my first post and I hope I am posting it in the proper location! I have been using your strength training dvds for a long time (years) and love them, and I also do many other types of workouts (Pilates, Ballet, Yoga, tough dance cardio, etc). I recently began STS and am following the program doing STS, cardio, STS, cardio, STS, etc.. I am noticing that I while the workouts are great and I am working hard, I am generally not working as hard as when I have used your other dvds in conjunction with other dvds and classes I go to. Can I go ahead and add an additional day of weight training or perhaps another day of lighter weight training to the three days of STS for the week, or will that compromise the effectiveness of STS? Thank you.