Got this as a supplement to P90X and Insanity, and I returned it immediately. Tried a couple of the DVDs and didn't even make it through any of them. Granted, they bill it as a workout that's not a "graduate" program as Insanity and X are, but the day I tried it out was after already doing a P90X workout. After turning it off I went to walk my dog and got about the same workout I would have from the DVD, without the annoying instructor. Returned for a refund, minus shipping and return shipping, but happier to be out the $22 or so for shipping as opposed to over $90 for something I would never have used again.Note: I give it two stars as MAYBE for people who aren't in shape could benefit from this. But my thinking is if you can walk a flight of stairs without stopping halfway, this will not be a challenge.