I was looking for a chin up bar that doesn't require difficult assembly and won't destroy the door trim and this one is an excellent equipment. I'm not a heavy person but I was doubtful that it could actually bear my weight considering it doesn't involve bolting the piece on the wall or trim. When I realized the genius physics behind it, my doubts are gone. The upper bar pushes the weight forward thus being supported on the upper wall of the door (and not the trim) and the lower bar is pushing the trim, therefore the forward force is negated, as long as you're not rocking the equipment and both your walls and trim is in good condition, then this equipment will work for you. So far, I'm having a good workout and I could feel it in my arms, chest and back. Thank you.