Quite. It's even recommended . But doctors say that it is very important to dress properly - so that you do not overheat, do not freeze and do not slip. Elderly people and people with diseases of the cardiovascular system should listen especially carefully to their advice . It is better for them to consult a doctor separately - is it worth running or not.
With SARS, if there is only a runny nose or a little sore throat, and the temperature is normal, you can also train. But it's better to do without big loads .