That's the first article that shows for googling [covid-19 vascular disease].
Basically my understanding of the current understanding is that COVID-19 is better thought of as a disease that can cause blood clots, particularly in several organ systems, particularly in the lungs -- you start getting blood clots in your lungs and consequently can't breathe very well.
https://www.nytimes.com/2020/08/17/opinion/covid-19-heart-di...
https://www.forbes.com/sites/robertglatter/2020/08/17/covid-...
Who cares? Why is "economic" harm so important?
I'm really tired of people saying "But what about the economy?" I really don't care. I care about my health and the health of my family members. If some artisan dog biscuit company goes out of business, so be it.
The "economy" is just our way of measuring what people do for themselves and others all day. "Some artisan dog biscuit company" is someone else's lifelong work and dream, not just a number in a spreadsheet. Minimizing may make you feel better about selfishly demanding everyone turn their lives off, but it's not an accurate representation of the world.
It's not just about you
If muscle mass or fitness is a concern, work out at home. Or outside. Ride a bike, go for a run, do some pushups. Pick up large rocks. Buy a squat rack or rowing machine. Go climb a mountain.
Access to a gym is absolutely not required to maintain fitness.