My cousing gave me a 5 dvd set of Jillian Michaels workouts for my bday in april. Just tried the first 2 yesterday. WOW. I have watched Biggest Loser before but these workouts are a challenge. They are only 29-32 min long, so I did 2 for one day's workout. She splits them into working your front side and back side. The are circuit-ish, because you will do bootcamp style cardio to warm up and then move quickly through the weight training and push ups, etc.and then she throws in more cardio here and there so your heart rate is always very high. It was a great work out. I am very sore. I am used to 6 days a week with Cathe and I thought her dvds would be easy, quite frankly, I was wrong. Highly recommend for the hardness factor...but she is NOT good at cueing, her movements are totally akward, she was very akward in front of the camera and her wardrobe was bad. I bring up these things only because it make you realize the high quality work that Cathe puts out there. She is such a wonderful instructor. All that said, I will be adding these dvd's into my routine for a while. Just thought I'd share!