According to medical experts, coronavirus introduces a liquid substance into the lungs that makes people that have it cough if they hold their breath for long. Mind you, people that have ordinary catarrh can also cough if they hold their breath, we are also told.
But we came accross this video below that is like a sort of ‘do-it-yourself’ test, testing if one can hold their breath for a specified period of time. You can take the breath test in the video and see if you pass. But remember: no one can hold their breath for a prolonged period of time without gasping for breath. And as we said, a congested heart can bring the same results. I guess it should better be called a lung-health-check. See the breath test in the video: