Fortunately, I wasn't bothered. I've spent much of my career working where there were no gyms, or mediocre work ones with a rickety bike and a dumbbell or two. I also go on the road for work which means searching out hotel gyms or places to run that won't kill me. I've always liked exercising outside much more than in a room surrounded by strangers.
I borrowed some dumbbells and started using my old, but good stationary bike more. I run on the trails by my house. I find myself walking and hiking a lot more, even if it's only an hour at a time.
I started hiking up the local ski hill. Absent the usual crowds, it's easy to find a deserted run to snowshoe or walk up. From there I can gaze out into the forbidden park or at the lake far below. No bears lurk there, so I can hike without yelling or having bear spray at the ready.
Lifting weights at home, when I can watch
Some people are having a hard time with their gyms closed. The gym is their comfort zone and their therapy. But it's good to get out of that zone and to challenge yourself in different ways. Your body wants to be outside and moving in the fresh air. Take it there!
I don't miss the gym at all. I might not go back.