I've been doing yoga for 22 years, but I'm not a purist. If you're used to true yoga (and kind of precious about it!), you may be frustrated by this workout. If you're familiar with yoga (beginner-intermediate level) and want a "power" version of it - more cardio, more reps - you'll like this DVD. I wouldn't call it a "meltdown" but it's definitely "power" [yoga].
There are 2 x 30 minute workouts, Level 1 and 2. I found little difference in challenge between the two, actually, and do both back-to-back, despite the cool down and warm up twice over. As with all Jillian's DVDs, she offers ways to increase and decrease your level of intensity throughout. My only criticism of these workouts is I found that, after a few weeks and after the workouts became less challenging, I reached for them less and less often - which is not the case with some of her other DVDs (Hard Body, Ripped in 30). I don't think this is her strongest effort, but I do think it's a worthwhile DVD for anyone looking to try something new or curious about yoga - a ramped up version of it. If you are beginner or intermediate level in exercise, you will get a very good workout. If you are closer to intermediate-advanced, skip this - you will not be challenged enough. (Try her Extreme Shed & Shred DVD instead.)