> One observation from Buteyko materials that sounds right (and would be easy to verify) is that only one nostril should be active when you aren't exercising, a

> One observation from Buteyko materials that sounds right (and would be easy to verify) is that only one nostril should be active when you aren't exercising, and there is a ~3? hour cycle where they swap dilation repeatedly through the day and night. It’s called the nasal cycle.