I've been an emacs user for many years. The last couple of weeks I've noticed my fingers loosing their "fluidity" and feeling a bit stiffer (resulting in a lower keys per minute count and more mistakes). I would like to ask whether this is alarming and what I should consider as possible remedies (e.g. keyboard, room temperature, diet, finger exercises, rest, etc.).
Of course this is off-topic. Your fingers are not a part of a computer, nor are they software. You could ask this on Quora or maybe chat, but I don't think any existing SE site would field such a question based on their topicality rules.
Honestly, when I first read this question, I thought that maybe it was a joke. If it is a joke, ha-ha, you got me. But if you were being serious, then I just want to make it clear that asking how to make your fingers nimbler is definitely not topical for Super User.
Edit: Actually, it might be topical on Fitness.SE, though I would recommend posting a meta Q there before asking, because I'm really not sure. I've never asked a question on Fitness.SE before, and I haven't even joined their site. But based on a quick scan of their FAQ, it looks like this question could at least be within the general topic realm of what their site is about.
You would really have to remove the whole bit about emacs, though, and make the question generically about how one would go about making their fingers more dexterous for rapid keyboarding.
See Here -- it looks like this question may have already been asked (or something very close to it) on Fitness.SE, and it wasn't closed. In fact, it has +1 upvotes. There may not be a lot of interest in this particular topic there, but at least the type of question is accepted by their community.
I disagree that a question like that would generally be off-topic for Super User.
We even have rsi for "Questions relating to Repetitive Strain Injury", which is very much on-topic for our site as it can be categorized under interaction with computer hardware.
However, if you have a medical issue, you should talk to a physician, not computer geeks.