I bought Jillian Michaels' 30 Day Shred a few years ago, and I still use it to this day. Maybe not consecutively, as it is probably supposed to be used for, but it still works. When I first bought it, I wasn't avid on exercising, since then I am much more fit but I still pop it in the DVD on those days when I don't have much time for a good workout.The content within the DVD is great, I love Jillian - she's the best drill sergeant you can ask for. The workout are relatively simple to follow but pack a punch if done correctly and efficiently.Overall a good purchase for those beginning to workout or those in need of a good and brisk workout.