I am beginning to suspect that it is surprisingly common for intelligent, competent adults to somehow make it through the world for a few decades while missing some ordinary skill, like mailing a physical letter, folding a fitted sheet, depositing a check, or reading a bus schedule. Since these tasks are often presented atomically - or, worse, embedded implicitly into other instructions - and it is often possible to get around the need for them, this ignorance is not self-correcting. One can Google "how to deposit a check" and similar phrases, but the sorts of instructions that crop up are often misleading, rely on entangled and potentially similarly-deficient knowledge to be understandable, or are not so much instructions as they are tips and tricks and warnings for people who already know the basic procedure. Asking other people is more effective because they can respond to requests for clarification (and physically pointing at stuff is useful too), but embarrassing, since lacking these skills as an adult is stigmatized. (They are rarely even considered skills by people who have had them for a while.)
This seems like a bad situation. And - if I am correct and gaps like these are common - then it is something of a collective action problem to handle gap-filling without undue social drama. Supposedly, we're good at collective action problems, us rationalists, right? So I propose a thread for the purpose here, with the stipulation that all replies to gap announcements are to be constructive attempts at conveying the relevant procedural knowledge. No asking "how did you manage to be X years old without knowing that?" - if the gap-haver wishes to volunteer the information, that is fine, but asking is to be considered poor form.
(And yes, I have one. It's this: how in the world do people go about the supposedly atomic action of investing in the stock market? Here I am, sitting at my computer, and suppose I want a share of Apple - there isn't a button that says "Buy Our Stock" on their website. There goes my one idea. Where do I go and what do I do there?)
My impression is that getting so tired from moderate exercise is way outside the normal range. I have no idea if it might indicate a medical problem, or is just individual variation.It may just be that the cultural belief that exercise is good for everyone is false.
An alternate possibility is that you move very inefficiently. I was shocked to find out how much muscle tension was restricting my breathing, and how much difference it made to loosen up even somewhat. The best book I've seen for exploring that is The 10-Minute Rejuvenation Plan: T5T: The Revolutionary Exercise Program That Restores Your Body and Mind.
There's a certain amount of woo woo in it, but there's also clear explanations of how to get more flexibility and relaxation so that you can get more air, and there's a warm-up which improved my body awareness to the point that I could realize that a move which was difficult for me was because my shoulders and chest were too tight, rather than because I was an inferior person or because the universe was out to get me. I'd also hypothesized that muscle tension might be the problem, but there's a huge difference between a hypothesis and actually feeling what was going on when I did the move.
On the other hand, the way tenseness interacts with exercise for me is that exercise tends to feel really bad to me (less so as I become less tense), and then I stop, so t don't know whether I'd end up with that much exhaustion if I pushed.