

I learned to do some Buteyko breathing techniques, which uses this principle as a way to help some chronic conditions.
My main takeaway was to focus on nasal breathing, controlled breathing patterns, and reducing over time the amount that you inhale unless necessary to operate.
Oh yeah, my experience is using it with asthma, particularly aggravated by exercise. Reducing hyperventilation actually helped reduced symptoms that persisted despite being otherwise well controlled on medication. Unfortunately you’re right it did go trending at some point so there’s all sorts of harmful bullshit out there.