This is one of my all time favorite workouts that I've had for years. I used to do it on a regular basis but have so many workouts that I have workout ADD. But no matter what new and shiny workouts attract my attention, this one remains a staple for me. I like that it can be done in a small space. I used to do it in a small section of my bedroom in my apartment when the living room wasn't available or I just wanted to be alone. The space is not an issue for me at this time, but just thought I'd mention it for someone who doesn't have a lot of space available to work out in.There are 2 levels each for abs, arms & buns (which is the section I like the best). So you're getting 6 separate 15 minute workouts, complete with short warm-up and short cool-down. The 2nd section of each category is the advanced version. I don't know how hard it would be for a truly advanced exerciser, because I've never been one. When I've been working out on a regular basis, I can do level two but when I've been slacking, I stick to level one. Especially for the abs, that one is tough and kills me every time. But then I've never enjoyed working my abs. None of the moves are crazy and are classics but they are sequenced in a way that is really effective. At the beginning, she says that the moves are all tested in a lab to determine which ones work the muscles the most. I believe her because I always feel it the next couple of days!Tamilee excels, to me, at working the buns. I usually use a step along with the workout because I feel it in my glutes more when doing the forward lunges and it feels better for my knees. During the back lunges, I stand on the step and step back off the step. I think the "Buns" section is the one I use the most.You can increase the weight because she doesn't move very fast but I think the highest I've used is 8 or 10lbs. I like the feeling of strength in my body using weights on a regular basis but if you are more concerned with visible results, don't worry you'll get them. This workout really firmed up my shoulders and arms and I found myself touching them a lot. And wanting to wear sleeveless shirts, go figure. It also flattened my abs (no six-pack though, I'll never work that hard or have low enough body fat, haha). It made my glutes rounder and more lifted. They grew too but squats and lunges always work that way for me, especially when using a step.Now that I think about it, I don't recall any focused work for the chest, back, hamstrings or calves. But I also do kettlebell workouts so the posterior chain is worked in those and I do vary my workouts anyway.I was already a fan of Tamilee Webb from Buns of Steel 3 and 4. I like her personality; she is not annoyingly perky or loud but is still friendly and encouraging. I will never, ever let this one go and if something happens to this DVD, I would definitely buy another copy.