Four equal phases create a structured, calming rhythm. Popular with athletes and military for reducing stress and sharpening focus under pressure.

Developed by Dr. Andrew Weil to activate the body's relaxation response. The extended hold and slow exhale engage the parasympathetic nervous system.

A double inhale through the nose — slow first, then a quick burst to top off — followed by a long, full exhale. The fastest known single-cycle stress reset.