Let’s take swimming out of the equation and I say never.
I never have and never will
While I was in the park doing some stair work (1500 up 1500 down...i will let you know how I feel tomorrow!) when some larger chaps started to do some push ups / chin ups using the park equipment
It was not a hot day. In fact with a strong wind up it was pretty cool...although to be fair I am pretty soft and find almost every day cold
After about 5 minutes of exercising they stripped down to just their shorts. And flexed. And preened. And occasionally exercised
You might ask why I did not move or look away. It is pretty hard when you are on stairs...