Box breathing is a structured breathing exercise in which each phase of the breath — inhale, hold, exhale, and pause — lasts for an equal count of four seconds. The four equal sides give it both its name and its visual metaphor: a square, or box.
It is also widely known as square breathing, tactical breathing, and by its classical Sanskrit name Sama Vritti Pranayama — sama meaning "equal" and vritti meaning "fluctuation."
Breathe in slowly through the nose for 4 counts.
Pause at the top of the inhale for 4 counts.
Breathe out slowly and smoothly for 4 counts.
Pause at the end of the exhale for 4 counts.
Sama Vritti Pranayama appears in classical yogic texts as a foundational equalising breath, practised to steady the mind before meditation. The term "box breathing" gained wide recognition through Western performance and military training, popularised by former Navy SEAL Commander Mark Divine. The technique is the same; the name and context differ.
Researchers have studied paced breathing and slow breathing techniques in relation to autonomic nervous system activity, heart rate variability, and self-reported stress. Box breathing belongs to this broad category. Results are promising in several areas — the research is ongoing and individual responses vary.
Most people begin with 4 rounds of 4-4-4-4 and build from there. A typical introductory session is 4–8 minutes. The Breathe Even app guides each cycle with visual animations and optional voice cues.
Practice box breathing with guided sessions, streaks, and relaxing music.
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