I think it works, probably more to some people and less to other, but I think that if you jump so much some effect it must make to you, I don't think they would make a Program that doesn't work at all, and if they're winnin' money sellin' it at least the company would make some research of the exercices, and get some information before it gets out. I don't think they would sell a program that hurts people. In most cases it doesn't work because people don't do the exercices correctly, I've heard that people has problems with the knees and stuff, and all this people that got hurt didn't watch the aa3 video, you can download this video with a p2p software, the video explains how you gotta do everything including stretching and all this thing to prevent injuries!
doubag!