The other highlight of the day was my ongoing experiments on myself with respect to movement, which I had intended to witter about, but (1) it got late and (2) when I came to actually look up "neuromuscular/movement patterning" as terms for That Thing about The Process Of Learning Physical Skills I could... only find a bunch of people selling movement coaching services. Working out what the academic terminology for this is: now on my infinite todo list.
(tl;dr I made a back muscle very unhappy a few years ago now; ever since it has been prone to Twinges but not actual dysfunction, which I've been interpreting as Nerves Primed To Go AAAAH; managed to push it past twinge into persistent unhappiness on Saturday, and have spent the past few days playing around with how it responds to various kinds of movement in terms of better/worse/about the same...)