Take it slow when returning to exercise after COVID

Dear Doctors: I'm a healthy 61-year-old woman, still tired and a bit sick after five days with a moderate bout of COVID. I want to exercise again when I'm symptom- free. Would a 20-minute walk a few times a week, and a few gentle sessions of more vigorous exercise, be a good way to start?

Dear Reader: We're getting versions of your question from quite a few readers these days.

And no wonder. In Apri…