The reason Cathe mentions using the S&H workouts for a 3 week rotation is because she recognizes that it is quite tiring to maintain that mental focus for a long time. These workouts do require a different degree of focus than her regular weight training DVDs, to maintain proper form, but I always liked it. I always feel and felt rushed during endurance type, total body training such as Muscle Endurance, and I liked being able to take my time, think about each move and nail the form.
I also used to do these workouts for longer than the 3 week rotation length suggestion by Cathe and saw even better results in increased muscle mass and strength. I would do each workout twice over a 9-10 day period for about 6, 7 or 8 weeks at a time. Loved it. For a hard gainer such as myself, at least with the upper body, it was perfect.
Clare
grandma