According to the book "The Oxygen Advantage" medical autopsies show that at least 80% of people breathe incorrectly. Poor breathing habits lead to headaches, sleeping problems, neck aches, overworked neck and chest muscles, strained cognitive functioning and so much more. Learning to breath properly is one of the simplest and most profound ways to improve one's health and mental clarity, as well as to neutralize stress. The techniques I practice and teach are many thousands of years old, coming from the yoga tradition.
I stumbled upon the benefits of deep breathing 6 1/2 years before I started learning yoga, from snorkeling almost every day beyond the big waves when I lived in a tiny unspoilt village in Sri Lanka. I would go down about 5 meters and grab hold of rocks to be able to stay underwater longer, so that I could see the beautiful big fish. I would stay as long as I could, then come up for 6 or so deep breaths, then go back down. I could stay underwater for 2 1/2 minutes, and do this for an hour or more. When I would come out of the water I would notice that my mind was so quiet yet focused, I would feel deeply at peace and connected to all the nature around me. Later I noticed that I hardly ever got sick and that the bronchittis I was plagued with as a child and adult had mostly disappeared. Once I was even able to hold my breath for 4 minutes, this was a big surprise. When I finally started doing yoga years later, I realized I had been doing advanced yogic breathing (pranayama) when snorkeling in the ocean.