Gee; I wonder if keyboarding this computer helps with concertina fingering any? Since my body isn't up to much else these days I get a fair amount of that "exercise" in.

One nice thing about the concertina is it's fairly portable.
Much more so than a piano, for instance.

Used to play harmonica, but every time I played it I'd catch a cold, so after a while I gave it up. Even soaking it in beer like some of the Blues players suggested didn't help.

Concertina seems a bit more hygienic at the very least.

Practicing is a great way to pass away idle time, for sure - and it does not annoy Domestic Management nearly as much as the banjo.