As far as virulence and unpredictability of viral infections go, COVID-19 is right up there. Not just with symptoms and response, but in recovery and rehabilitation too, wide variance is being observed. The disease affects everyone differently and the impact of long-term effects are still being discovered.
While exercise and movement are therapeutic for illness in general and strongly encouraged, crafting general recommendations/advice for resuming activity and exercise post-exposure to COVID-19 is not easy because of this variance. We now know that the virus can impact multiple organs and systems (heart, lungs, liver, kidneys, musculoskeletal, etc.) and some effects may be silent and/or protracted. Many people have reported breathlessness and high and prolonged fatigue, making resuming activity and exercise difficult. Even otherwise fit and healthy people have not been immune to these challenges.