Box Breathing: A Guided 4-4-4-4 Exercise

What is box breathing?

Box breathing, also called square breathing or 4-4-4-4 breathing, is a slow breathing pattern with four equal sides: breathe in for 4 seconds, hold for 4, breathe out for 4, hold for 4. Picture tracing the sides of a square. One cycle takes 16 seconds, so you breathe a little under four times a minute — much slower than the 12 to 20 breaths a minute of normal resting breathing.

It is now taught everywhere from therapy offices to sports psychology. Its appeal is that it is simple, silent and can be done anywhere: in a meeting, before a presentation, in bed.

Where box breathing comes from

The pattern is much older than its name. In yoga it is known as sama vritti pranayama — “equal” breathing, one of the breath-control practices of pranayama.

The name “box breathing” and most of its fame come from Mark Divine, a former US Navy SEAL commander. In a 2016 essay for TIME, Divine wrote that he picked up breath control through martial arts during his SEAL training, and described box breathing as leaving you calm but alert — neither sedating nor stimulating. He suggests a 10- to 20-minute session a day plus short one- or two-minute “spot drills” when you need them.

A close cousin, “tactical” or “combat” breathing, is taught to soldiers and police officers to steady the body in high-stress moments. Much of that teaching traces to retired Army Lt. Col. Dave Grossman’s book On Combat: the US Defense Health Agency’s Tactical Breather app is built on methods from it.

How to do box breathing

1. Sit upright and comfortable, feet on the floor. Let your shoulders drop.
2. Exhale fully to empty your lungs.
3. Inhale slowly through your nose for a count of 4.
4. Hold with your lungs full for 4. Keep your throat and shoulders relaxed.
5. Exhale slowly through your mouth or nose for 4.
6. Hold with your lungs empty for 4.
7. Repeat for 2 to 5 minutes.

The pacer above does the counting for you: the circle grows as you breathe in, stays still while you hold, and shrinks as you breathe out. It always finishes on a complete cycle.

Does it work? What the research says

Slow, controlled breathing is one of the better-supported quick relaxation tools. Research on box breathing itself is thinner than its popularity suggests, though. Here is what has been tested.

• Slow breathing in general. A 2018 systematic review in Frontiers in Human Neuroscience pulled together 15 studies of breathing slower than 10 breaths a minute in healthy people. Slow breathing went with higher heart rate variability (a sign of the body’s “rest and digest” side at work) and with people feeling more relaxed and less anxious. Box breathing, at about four breaths a minute, sits well inside that range.
• Box breathing vs other techniques. In a 2023 Stanford trial published in Cell Reports Medicine, 108 adults did five minutes a day of box breathing, cyclic sighing, cyclic hyperventilation or mindfulness meditation for a month. Every group felt less anxious and in a better mood after their sessions. Breathwork as a whole lifted mood more than meditation, but only cyclic sighing (long, slow exhales) clearly beat meditation on its own. No group showed significant changes in resting heart rate or heart rate variability.
• Under pressure. In a 2023 Texas State University study, 79 adults went through a virtual-reality active-shooter drill. Those who did five minutes of slow, box-style breathing (in 4, hold 2, out 4, hold 2) before and after the drill avoided the jump in a saliva stress marker seen in the group that breathed normally.
• The honest summary. A 2026 review of randomized trials of box breathing found short-term benefits for perceived stress, anxiety and mood in several studies, but mixed effects on heart rate and heart rate variability, small studies, and little long-term follow-up.

Box breathing is not a treatment for anxiety disorders or panic attacks, but as a daily habit or a tool for a stressful moment, it is low-effort, free and has very little downside.

Tips for getting it right

• Shorten the count if 4 feels hard. 3-3-3-3 is still box breathing. Build up to 4, or 5, over time.
• Don’t strain the holds. A hold should feel like a pause, not a struggle. Relax your throat.
• Breathe low. Let your belly expand on the inhale rather than lifting your chest and shoulders.
• Make it a habit, not just an emergency tool. It works best in a stressful moment if you have practiced it when calm.

Stop if you feel dizzy or light-headed and return to normal breathing. If you have a heart or lung condition, or are pregnant, check with a doctor before practicing breath holds.