"I would be seriously surprised if exercise has any serious affect on it."
Well... kinda. The knock-on effects of exercise would include better cardiovascular health, lower blood pressure, better weight control and more energy to do more stuff (it sort of feeds on itself). Why do we care? Aside from age what seems to be the biggest factor in whether you'll get sick / die of the Wuhan virus? Being unhealthy! High blood pressure, diabetes, respiratory and cardiovascular problems. 6 months ago I'd see 1-2 people maybe when I went out to exercise. Now I gotta keep maneuvering around all these silly people that have discovered the need to walk their stupid undisciplined dogs. Ok so I got a thing about that. Point is, all the movement I'm seeing can't help but be a net positive for these people. Myself I'd take being strong and healthy over a prescription for hydroxychloroquine (almost had it, missed the second "h") any day of the week.