I won't go into the contents or structure because that's already been done. I just want to say that I enjoy this workout a lot and sweat every time I do it. I'm high intermediate/low advanced and I work up a good sweat following the advanced exercisers. The moves are athletic and simple enough to modify so you can create a higher or lower intensity workout. I like that fact that the active recovery phases include some toning work -- I think that's more useful than doing grapevines or step-touches while your heart rate comes down.

This workout has been compared to NAC Interval Challenge by other reviewers, and I'll do the same. I like them both and get about the same level workout either way, but they're very different. With the rotating instructors on Interval Challenge and the banter that goes on among them, I feel a lot like it's their show and I'm the audience. Although the choreography is more interesting on that tape, I get a better feeling from Kathy, as though she's providing instructions to ME and encouraging ME, rather than focusing on the people around her. It may seem silly, but I especially like her encouragement during the intervals, where she verbally pushes you to exert until you're "breathless." Her form is great and she gives good pointers throughout.

The only thing I'd criticize about this tape is that Kathy doesn't provide low-impact alternatives for some of the interval moves. It's certainly possible to push your heart rate up there without high-impact, but that's not addressed in her instructions.

Finally, I find the length of this video perfect for combining with others. I've done a 20-minute Pilates workout afterwards and felt just great!

Randy Pollack