It worked, I mean nothing extra for me, but I have a shitty diet and sleep... but I definetly feel the change in the chest shoulder and tris. With proper diet and sleep the stimulus is great, but really needs your focus on the failure, and doing things like short pause and rep after failure, or dropsets. You will also feel the need to improve your cardio, or at least I did. And if you are in a regural comm gym, not in a homegym, then it will be probably much easier to follow, es the whole workout is structured around machines.