Powerbar can be fitted to most door openings without the need for screw fixings, the pull up bar is actually higher than the top of the door frame so you don't have to struggle to keep your feet off the ground and even better still the lower bar supports your forearms to help prevent uncontrollable swinging. Powerbar uses a unique counter balance system to spread your weight into the wall rather than down on the doorframe. This means that it wont leave marks or create damage and that it can be put up and taken down again in seconds. It's not just a chinning bar either, with a combination of pull ups and leg raises you can practice a wide range of exercises. When removed from the doorway and placed on the floor it can be used for wide arm push ups too.