I've been thinking about one of those pullup bars, but I'm terrified at the idea of tearing the door frame off and having it and the steel frame come crashing down on top of me. Is this a valid concern?
Mine came with a thin metal shim that slid easily between the wall and doorjam that prevents the unloaded bar-anchor from shifting away from the wall+doorjam. Once the bar is weighted, there's no way that can happen anyway (the shim is really optional and you could improvise similarly with finishing nails).
Worst case realistic scenario: (if you keep the area in a possible crash zone free of spikes and furniture corners) is that you bang up your knee a little. I'm assuming you're just doing pullups, of course.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: