Stress relief

Box Breathing

Navy SEAL calm under pressure

Box breathing — also called square breathing or 4-4-4-4 — is a four-phase pattern of equal length: inhale, hold, exhale, hold. It is the breathing technique taught in Navy SEAL training for staying calm under high-stress conditions.

Why it works

The equal-length cycle stabilizes heart rate variability and signals the vagus nerve that you are safe. The hold phases, in particular, raise CO₂ tolerance slightly, which dampens the fight-or-flight response. Studies in occupational stress contexts show measurable cortisol reduction within a single session.

How to do it

1. 1 Sit upright with feet flat. You can do this anywhere — desk, car (parked), bathroom stall.
2. 2 Exhale fully to empty your lungs.
3. 3 Inhale through your nose for 4 seconds.
4. 4 Hold the breath in for 4 seconds.
5. 5 Exhale through your mouth for 4 seconds.
6. 6 Hold empty for 4 seconds. Repeat 8 cycles (~2 minutes).

When to use box breathing

• Before a high-stakes meeting or presentation
• Right after a stressful email or call
• Workout warm-up for nervous system regulation
• When you cannot leave your desk but need to reset

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