Our capacity to breath, to inhale and exhale, has changed significantly during our evolution. Modern problems like asthma, anxiety and high blood pressure can be improved by changing the way we breath. About 90% of us are breathing incorrectly.
We assume breathing is passive and I'm like most people and have suffered from a variety of respiratory issues for most of my life. When I was studying Respiratory Therapy, I learned about normal breathing rates, lung volumes, different diseases, etc., but how we breath matters.
Humans are the worst breathers on the planet! We've adopted and passed on traits that have been detrimental to our health.