I am a big fan of Stacy McCarthy's videos. I have the Power Yoga as well as the Lean and Defined one. Both have similar poses, but this one has more difficult poses included. I love how Stacy doesn't over "Yogi" her instruction. Once you go through the DVD once, you'll be good to go (if you are familiar with yoga poses already). This video doesn't get me sweating, but I do feel amazing afterwards and definitely feel my muscles got a bit of a workout (and one that is very different from my other regular workouts (circuit training and running). I throw this video into my "every other day" rotation between harder cardio workouts and it makes a perfect balance. I've done many yoga videos, and besides the people at YogaWorks, she's right up there in practical, easy-to-follow, can listen to every day, yoga instructors. Some people have complained about the background noise in this video. It advertises as being a "live" class. So no surprise there is background noise. If you focus on the practice, you barely notice after the first time.