Less Wrong Product & Service Recommendations

lukeprog

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:

Post one product your recommend per comment, so they can be discussed and voted on independently.
Provide a link for purchasing the product.
No books, movies, TV, games, or music. (These should go in other threads, like this one or this one.)

I'll post my own recommendations to the comments section, too.

I have often benefited from recommendations for Things I Didn't Know I Wanted.

Rules:

Post one product your recommend per comment, so they can be discussed and voted on independently.
Provide a link for purchasing the product.
No books, movies, TV, games, or music. (These should go in other threads, like this one or this one.)

I'll post my own recommendations to the comments section, too.

$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?