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Jonathan_Graehl comments on Less Wrong Product & Service Recommendations - Less Wrong
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$30 Doorjam pullup bar - a few repetitions per week makes a big difference and take little time or energy. Better design than the old in-doorway bars. Should be prophylactic against hunched-forward computer posture, and helps me feel better in a way that volleyball and soccer don't. I used to gym-weightlift regularly but found it too demoralizing (to approach personal limits and then injure yourself is silly).
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.