Hi Cathe, I am wondering about your opinion on waiting just 24 hours between lifting for the same muscle groups, rather than 48. For example, I did your High Reps dvd yesterday, and feel like doing back and chest from Slow and Heavy today. High Reps works these muscles as well, but not in as concentrated a way as Slow and Heavy does. Would it be okay for me to really work chest and back hard today after HR yesterday? This question always seems to haunt me. Thanks so much for your fabulous workouts.