Taking deep breaths and forcing a cough can help clear mucus, but these techniques are unlikely to prevent or treat coronavirus infections – here’s why
Source:
https://www.newscientist.com/article/2241191-can-breathing-exercises-really-help-protect-you-from-covid-19/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home