Box Breathing
4-4-4-4 breathing pattern used by Navy SEALs. Balances the autonomic nervous system and provides calm focus under pressure. 5-10 minutes is a full session.
Dosage & Timing
Evidence Strength
3/5 — ModerateModerate evidence. Well-established in military and clinical settings. Mechanism (vagal tone modulation) is sound. Limited RCT data specifically on box breathing.
Overview
A structured breathing pattern: inhale 4 seconds, hold 4 seconds, exhale 4 seconds, hold 4 seconds. Used by Navy SEALs and first responders for stress management. Effective for bringing the autonomic nervous system into balance.
How To Do It
Inhale 4 seconds
Breathe in through your nose for 4 seconds.
Hold 4 seconds
Hold your breath for 4 seconds. Stay relaxed.
Exhale 4 seconds
Exhale slowly through your mouth for 4 seconds.
Hold 4 seconds
Hold at the bottom for 4 seconds. Then repeat.
Continue for 5-10 min
Start with 5 minutes. As you advance, extend to 5-5-5-5 or 6-6-6-6.
The Evidence
Each claim is linked to its source study. Confidence reflects the study design — systematic reviews and RCTs rank highest.
Slow breathing techniques before bedtime and the effects on sleep↗
Slow breathing interventions can improve autonomic balance and sleep-related outcomes.
Primary Literature
Who Popularized This
Interactions & Warnings
Contraindications
- ⚠Severe anxiety about breath holds (start with shorter holds)
Interactions
- •Can precede meditation or focus work
Measurable Outcomes
Related Protocols
Physiological Sigh
Double inhale (nose) + long exhale (mouth). The fastest evidence-based technique to reduce acute stress — works in 1-3 breaths by activating the parasympathetic nervous system.
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