I just got mine @ walmart, and after going through the struggle of putting it together
I decided I was going to run through the entire workout. Boy was I in for a shock! I'm not the most in shape person, and I didn't realize, until that night, how weak/out of shape my arms were. I pretty much felt a slight burn everywhere else during the workout, though I felt the ab workout was kind of weak. However I must point out that it's really whipping my arms into shape!!!