The Buteyko method
Most breathing advice says breathe deeper. Buteyko says the opposite: modern people chronically over-breathe, and the fix is lighter, nasal breathing. Trials show reduced asthma symptoms and reliever use — but not improved lung function, so never reduce asthma medication on your own.
Practise light nasal breathing →Nose vs mouth breathing →Breath holds & CO₂ tolerance →
Breathe is a free guided breathing and meditation web app — no download, works in your browser. Enable JavaScript for the interactive guided session.