Funnily enough, and for breathing reasons, although I was reasonably proficient at crawl, and swam a lot in the sea on holiday, I never mastered the breast stroke, so won precisely 0 swimming certificates at school. Demotivated, moi?
But when I went to University as a mature student, they had free swimming lessons, so I learned to do the breast stroke (a bit) before a move to Leeds and commuting meant I was unable to make the early lessons any longer. My Tai Chi lessons were similarly curtailed.
I've not swum in a proper pool in years. And most of the time when I have been swimming, I've had small kids to look after. I'd be no good at going to a gym, as I can't get my head round going somewhere to do exercise rather than getting it out & about.