I found a library’s worth of material. The problem was, the sources were hundreds, sometimes thousands, of years old.

Seven books of the Chinese Tao dating back to around 400 BCE focused entirely on breathing, how it could kill us or heal us, depending on how we used it. These manuscripts included detailed instructions on how to regulate the breath,

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“There are as many ways to breathe as there are foods to eat,” said one female instructor who had held her breath for more than eight minutes and once dived below 300 feet. “And each way we breathe will affect our bodies in different ways.” Another diver told me that some methods of breathing will nourish our brains, while others will kill neurons;

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