We know that breathing is essential for us to live, but we might not always be conscious of our lung activity, as busy as we are with our other daily activities. During the ongoing COVID-19 health crisis, it would be advisable for us to take care of our lungs. As doctors have learned, COVID-19 can cause a range of breathing problems from mild to severe. Keeping our lungs healthy so they function well could help maintain overall health during the epidemic. Jogging, running, swimming, cycling and other types of aerobic exercises have a positive impact on our lung function. Ryanto, for example, swims twice a week on his doctor’s advice, and the 30-something feels better, especially when pacing his breathing to swim laps at the pool. “When I swim, I hold my breath regularly for, say, 15 seconds, and being in a horizontal position helps me [expel] excess mucous from my...