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Why breathe works

What it does

A slow, guided breath: in through the nose, a soft hold, out through the mouth, then rest. A gentle tone rises as you breathe in and falls as you breathe out.

How it works

Slow breathing — especially a longer exhale — nudges the vagus nerve, the body's main brake. When it's active, the heart slows and the whole nervous system downshifts.

Why it works

Around six breaths a minute puts the heart and lungs in rhythm — called resonance — which raises heart-rate variability, a sign your nervous system is flexible and recovering well.

The evidence

• A 2018 review (Zaccaro et al., Frontiers in Human Neuroscience) found slow-breathing reliably slows the heart and reduces anxiety.
• Decades of heart-rate-variability biofeedback are built on roughly six breaths a minute (Lehrer & Gevirtz).
• A 2023 trial (Balban et al., Cell Reports Medicine) found brief daily breathing exercises improved mood and lowered arousal.

The honest bit

Breath work is one of the better-studied calming tools, but the effects are modest and aimed at everyday stress — not a treatment for medical conditions. If the breath ever feels forced, ease the inhale; that's the whole point.

Try 5–10 slow breaths, then notice how you feel.