Wear a mask: At the gym or exercising outdoors in populated areas
While the good news is that coronavirus doesn't appear to be transmitted through sweat, you still need to wear a mask when you're exercising at the gym. (Yes, we know it gets hot and uncomfortable.) Why? When you get your heart rate up and start breathing heavily and more forcefully, the respiratory droplets (that spread coronavirus and other illnesses) in your breath will travel farther, says Sandra Kesh, MD, the deputy medical director and infectious disease specialist at Westmed Medical Group in Westchester, New York. "If an infected person coughs in an enclosed area, like a gym, where the same air is constantly circulating, those particles can spread all throughout the room," she says.
You should also don a face covering if you're jogging, walking, or biking on a well-trafficked trail or sidewalk during your al fresco sweat session. Just be sure you can still breathe well enough to get enough oxygen, Dr. Weatherhead warns, otherwise stay inside or find a quieter area for outdoor recreation. If you're looking to buy a mask, check these places where you can still find them.
6 Times You Have to Wear A Face Mask—And 3 Times You Don't, Source:https://www.rd.com/advice/times-you-have-to-wear-a-face-mask/