4·4·4·4 s
Box breathing
Equal inhale, hold, exhale, hold. Originally used by Navy SEALs for composure under pressure. Works because it forces metered attention.
The protocol
Inhale for four seconds. Hold the breath in for four seconds. Exhale for four seconds. Hold the breath out for four seconds. Repeat. The four equal phases are why it's called box.
In the app you can scale every phase from two to eight seconds together. Start at four. Move to five or six only after the four-count feels natural and uncomplicated.
Breathe through the nose throughout. The holds should be comfortable — never strained. If you feel any panic during the hold-out, shorten the cycle.
Best for
Acute stress. Pre-meeting reset. When you can feel the cortisol.
Why it works
Box breathing doesn't raise HRV as dramatically as resonance breathing — the holds interrupt the baroreflex resonance. What box breathing does do is impose structure.
When you're in a stress spike, your breath gets shallow and irregular. Box breathing forces a sixteen-second cycle of metered attention. You can't hyperventilate during a four-second hold. You can't ruminate during a four-second exhale.
The U.S. military uses box breathing for the same reason: it's the most reliable breathing technique for catching yourself mid-spike. Vagal activation matters, but cognitive grip matters more in the moment.
When to use it
Acute stress. Pre-meeting reset. The moment you can feel cortisol climbing. Five cycles of four-by-four is roughly 80 seconds — short enough to do at your desk, long enough to actually shift state.
Not the best choice for raising baseline HRV (use resonance for that) or for falling asleep (use 4-7-8). Box breathing's gift is composure under load.
Or try a different technique