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Anonymous
I own a door gym. I'm happy with it. OP's pic looks like there's going to be damage on door frame where contact is made. I hope that's padded.
Anyway, the way that most of those work, OP, is that your downward pull (gravity) is manipulated so that force is applied perpendicular to the door frame itself and the wall above the door, causing a 'pinch' that keeps you and the bar suspended with little stress on the doorframe itself. Word of caution, though. Do not do any kind of abrupt swinging motions,
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