Cathe, I have heard from other instructors that people should generally limit their step workouts to 3 times per week. I don't have all of your workouts, but with the exception of Boot Camp, it seems like most have a pretty significant step component. I'd like to use your workouts more times per week. You have so much variety, and your routines are creative and fun to keep me thinking and sweating at the same time. I have trouble enjoying my old DVDs from other instructors now! I wonder if you know if that 3 times per week limit is just for people with knee problems, or what? I know you can't give advice for any one person's situation, and I know to watch for signs of injury. I'm just looking for general guidelines. Thanks!