Follow-up to: Boring Advice Repository
Many practical problems in instrumental rationality appear to be wide open. Two I've been annoyed by recently are "what should I eat?" and "how should I exercise?" However, some appear to be more or less solved. For example, various mnemonic techniques like memory palaces, along with spaced repetition, seem to more or less solve the problem of memorization.
I would like people to use this thread to post other examples of solved problems in instrumental rationality. I'm pretty sure you all collectively know good examples; there's a comment I can't find from a user who said something like "taking a flattering photograph of yourself is a solved problem," and it's likely that there are other useful examples like this that aren't common knowledge. Err on the side of posting solutions which may not be universal but are still likely to be helpful to many people.
(This thread is allowed to not be boring! Go wild!)
I wouldn't call SS the end-all, be-all solution for getting stronger, that would more closely be something like "progressive overload using compound exercises (or whatever you want to get stronger at) while under caloric surplus and having decent macro/micronutritional spreads. Also sleeping well and not having any other unusual health problems".
SS is a great program for beginners, but any other program that fits the above should work (like stronglifts). I also wouldn't recommend SS to intermediate or advanced lifters, when linear progression is no longer possible.