I swim, am so happy today it looks like the kids are back at school, so we 'oldies' can go swimming again, have not been for 6 weeks, our pool is always full of kids, screaming and splashing, like to go at least once a week, I swim for about ½hr, [with breaks in between] and I find that is about 16/18 lengths,
feel better for it, but I do have a nice sleep when I get home