I can see why this workout wouldn't be liked by advanced exercisers, but for overweight, beginner-to-intermediate level people like me, I find it ideal.The workout alternates basic step routines (the choreography is easy to learn) with floor aerobics, a couple sets of high-step climbs and four-limb moves. Some of it is high-impact, but this can all be modified. Because I have a bad right knee and severe arthritis, I usually don't use a step- I just do it all on the floor. My heart still gets a good workout. It is enjoyable. At the end, you have a set of spinal erector work, a couple of planks, some push-ups (not many), and a pretty challenging ab routine. After that, you stretch for a few minutes. It's about 45 minutes long. The music is non-vocal for the most part, but fun. It is tightly synchronized to the moves, one of the things the Firm used to excel at.It was made in the late nineties, and is a little dated, but that really doesn't matter. This is a great cardio workout for those us who aren't in phenomenal shape. But that said, someone who is intermediate or advanced could certainly make it more challenging by using heavier weights, upping their step height and jumping higher.Of all of the instructors, I like Nancy the best in this one. Her routines are a bit more dynamic and she seems more knowledgeable. Allie was a good enough instructor, though her speaking was a little unclear at times. Lisa was a little boring, but she had good form and cued pretty well.