[Huliwang]

When running you don't need to wear a face mask., because when running, you need lots of oxygen for the lungs, therefore for those who are doing strenuous  exercises don't need to wear a face mask.........

I play very safe. When no one around, the mask is on my chin. When passing someone, the mask is up to the nose. Then after running, I usually walk another 1 km for cooling down where mask is needed. .......