Breathing for stress release...

"Breathing is a perfect example of such a tool, Huberman said and he's working with colleagues to understand how different breathing patterns affect feelings of stress and tranquility.  
One breathing pattern they're studying is called "physiological sighs" -- pattern of breathing in which two inhales through the nose are followed by an extended exhale through the mouth.
Huberman explained how it works: "You have little sacks of air in the lungs, which increase the volume of air that you can bring in. Those sacks collapse over time, and as a result, oxygen levels start to go down and carbon dioxide levels go up in the bloodstream and body, and that a big part of the signaling of the stress response."

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