Ok so I see this thing every time I go into the gym, but I never see anyone using it (Most people are using the bench, etc.). So I'm not sure what it is and what it is used for. I know most of you have seen it and probably use it though. It looks like a pullup bar that has these steps in front of it. You then place your knees on the pad and go down, pulling yourself up. I understand the whole concept of doing the pullups, however, what is with the additional weights that you can choose? Wouldn't adding weight to it defeat the purpose of doing the pullup? (Makes the pad that your knees are on come up easier I would think) Anyhow, just thought I would ask