Doctor runs 22 miles with face mask to prove they don't impair oxygen levels
He's a moron. He's wearing some crap fabric mask with big gaps at the top to let in air. It probably doesn't restrict his air that bad but it's not blocking or filtering shit either. Completely pointless. The only masks that actually do anything are the N95 (rare) or the surgical mask when properly fitted tight around the nose (which nobody does).