Here is an instructional video to optimise and enhance your breathing and lung function. This video ws inspired by my students asking about a video they saw of an NHS (UK Health Service) doctor giving this breathing technique to help those that have breathing issues, due to Covid19 and wondering it was from yoga.
So, I thought I would answer this and give a more detailed run through of the technique.
I would say this practice should be done regardless to help boost your lung function and not just to be done when you already have breathing difficulties.
Good to learn and practice it for the lungs but also to help with stress, as any breath technique helps with that and lower stress equals better immunity.