I am an avid fan of work-out videos, and have quite a large collection. I bought three of Jillian's DVDs because I hadn't worked out and months and needed to try something new to motivate myself. The first one I tried was "no trouble zones". It was very difficult for me, but I'll also admit that I was pretty out-of-shape that day. The video is broken up in 5 or 6 minute circuits, so if you're struggling with one circuit, it's over pretty quick. This also makes the video as a whole go by rather quickly. The only I didn't like was that she didn't explain the moves ahead of time or show them in advance. All of a sudden it was, "okay, let's do this move" and she was immediately doing the move. I'm used to workout videos showing the intructor doing the move one or twice before having everyone join in, so I didn't like that. I'm also a big fan of doing moves to the beat of the music, which Jillian tends to ignore, so I found that a little annoying. Overall, it's a hard but effective work out.