Great when combined with other types of exercise
You are meant to do one of these workouts every day for 30 days, stepping it up a level when you feel strong enough. I am not sure who could do these workouts every day without blowing out their knees, despite Gillian's constant promises that you don't have to lunge/squat all the way to get results. After 2 weeks, I realized that my drive to get fit again would backfire if I continued to do this every day.So instead I do a shred workout 3-4 times a week and walk or walk/jog 2-3 times per week, giving myself 1-2 recovery days a week.This combination has been phenomenal. I feel a million times stronger, especially in my core muscles. Jogging uphill has become almost enjoyable (almost), if only because I can't believe how strong my legs have become.I definitely recommend this as a complement to another type of exercise, but I would never recommend doing these workouts every day.