I certainly have had to practice regulating my breathing, when wearing my covid mask for lengthy periods of time. At first it was difficult and uncomfortable, but I've now at a stage where it's almost comfortable. I breathe in and out through my nose slowly, using the abdominal breathing technique, and I also count each breath to stay focused.
This works for me, but it may not work for you. So I'm sharing this experience with you, while not recommending it. Each of us needs to find our own way of dealing with this issue.
Image courtesy of Bob Osias via Unsplash
