My doctors recommendation last year, was to keep doing what I was doing, but do more of it. Kick-it-up a notch. What was I doing, walking nearly every day for 30 minutes. For a couple of months, I increased my treadmill time, then the gyms closed down, and even when the gyms reopened, I didn't feel safe returning. After a few days closed up at home I started getting out for a walk. At first here on the hilltop, and things close to home. That grew boring, so I moved on. I have tried a few places, and have settled into a daily walk in a national wildlife refuge near home. My average walk is about 2 miles, and takes me 45 minutes to an hour. It is my alone time, my thinking time, my fresh air and sunshine time.
From my late 20's through my early 40's, I was a runner. I miss running, and my running days are past. And I am okay with that. I am very glad that I was a runner before digital music players and smartphones. I ran, as I walk, without headphones, with the thoughts in my head and the sounds around me as accompaniment.
I realize not everyone can walk for an hour. As long as you are able to get out and move, move the way you can. The longer we stay active, the longer we will be able to.
Besides, you never know what you might see or hear.