I was quite intrigued by this video when I first saw it on the shelf and read the back cover, thinking " What the heck, I'll give it a try." I am impressed! From the very first workout, I could feel my abs really working and the very next day, believe it or not, I could actually see a difference! My stomach got flatter and my sides definitely narrowed. I am extremely pleased with this video and highly recommend it. It is effective, fun and easy to follow. I'm just starting out with this workout, but I'm quite confident this is the one that will help me get leaner and more defined abs. Great workout!