The Visible Woman...plays.
A friend who is older than I am and still working asked for advice about retiring. I couldn't think of much to say. It really seemed easy to me: don't go to work and do more things you want to do. And...maybe catch up on some chores.
Well, in retirement (I've logged over eleven years now) I have taken time to do things I want to do. And one of those things is tennis. When schedules and weather permit, I get out and play three sets of hit and giggle doubles three times a week, playing a set with each of my friends if there is time. The participants change (and they range in age from 40's to 80's), but all are generally out there for fun. I use a racket that I bought before I retired. (I do buy new tennis shoes every couple of years.) Sometimes we play on clay. Sometimes hard courts. It is fun. It isn't really exercise exactly but it is moving around.
I hope I'm still doing it when I'm 80.