The Physiological Sigh
Two inhales through the nose, one long exhale through the mouth. The fastest evidence-based way to shed acute stress.
A double inhale reinflates collapsed air sacs in the lungs; the extended exhale slows the heart via the vagus nerve. Studied at Stanford as one of the quickest ways to move from wired to settled. Repeat one to three times — no app, no cushion required.