proper breathing technique optimizes our physiology and psychology. Use your nose and use your diaphram.
Check out additional resources
The Oxygen Advantage https://oxygenadvantage.com/
Wim Hof https://www.wimhofmethod.com/
Huberman lab Physiological Sigh https://psychsolutions.ca/the-science-of-physiological-sigh-insights-from-huberman-lab/
https://www.strengthfortwo.com