Box Breathing

What is box breathing?

Box breathing — also called tactical breathing or four-square breathing — is a paced breathing technique that uses equal-length phases: inhale four seconds, hold four, exhale four, hold four. It's used by U.S. Navy SEALs to regulate the autonomic nervous system before high-stakes operations.

The mechanism is straightforward: slow, controlled breathing at a 1:1:1:1 ratio activates the parasympathetic nervous system, lowers heart rate, and reduces cortisol within minutes. Unlike longer meditation practices, it requires no quiet room, no closed door, no setup. Tab, 60 seconds, back to work.

Three full cycles (about 48 seconds) is enough to register a measurable shift in self-reported stress. Five cycles is a sweet spot for a meeting break.