.. and touch-typists! I’m just now remembering being 13 and learning to type on manual type-writers. Ahh, the agony of “a” and “s” … and “;” and “'” …
I’ve never really thought about it before, but this must have made learning the whistle a lot easier than it would have been, for me at least. Certainly the idea of muscle-memory was obvious to me, in the same way that it’s really important to think “the” rather than “t-h-e” when typing.