10 seconds for me is a breeze. I rarely cough since I'm wearing mask every day to save myself. It also protects me from air pollutions.

I eat many healthy food. My cocktail of choice is garlic, ginseng, ginger and especially kimchi. I eat plenty of raw fruits and vegetables. I also have vitamin C and D supplements.

I do agree exercise is importnat. Perhaps this is where I can improve :|

Thannks for the tip about holding breath!
Stay healthy and keep being good, too ~