After a stressful or overwhelming experience, or when you feel shaky, braced, or disconnected and want to gently bring your body back to a sense of ground and safety.
The Voo breath combines three calming ingredients. A slow, extended exhale shifts the autonomic balance toward the parasympathetic 'rest and digest' state. The low vocal 'voo' adds vibration and engages the vagus nerve by way of the larynx and the muscles of the throat and soft palate (the same vagal pathway that humming and chanting draw on) which can help tone the body's calming brake. And voicing a deep, resonant sound produces a diffuse, grounding physical sensation that helps a keyed-up nervous system re-orient to the here and now.
Direct research on the Voo breath specifically is essentially anecdotal, it comes from clinical trauma practice rather than controlled trials. The building blocks are better studied: slow exhalation reliably supports parasympathetic activity, and vocal practices like humming and chanting (for example Bhramari) show measurable calming and vagal effects in small studies. So the mechanism is plausible and the practice is low-risk, but treat it as a gentle self-regulation and grounding tool, not an evidence-proven trauma treatment, and see the trauma-sensitive note in safety.
The Voo breath was popularised by Peter Levine, developer of Somatic Experiencing, a body-oriented approach to working with trauma and stress. Levine introduced the deep 'voo' sound as a way to use vibration and extended exhalation to help settle a dysregulated nervous system and restore a felt sense of grounding. It sits within the broader somatic tradition that treats the body (not just thought) as the route to regulation, and echoes far older contemplative uses of resonant vocal sound.
Begin with just a few rounds, checking in between each to see whether you feel more settled or more activated. If it helps, gradually extend to a few minutes. Over time you can pair it with orienting (slowly looking around the room) or with noticing supportive contact points (feet on floor, back in chair) to strengthen the grounding. There's no 'advanced' intensity to chase here; gentler and slower is the direction of progress.
Why the 'voo' sound specifically?
The low, deep vowel produces a strong vibration through the torso and engages the vagus nerve via the throat, a resonant, grounding sensation that a stirred-up nervous system can anchor to.
What if it makes me feel more anxious, not less?
Then ease off. For some people, turning attention inward or making sound can feel activating. Stop, open your eyes, look around the room, and come back to it another time, more gently, or choose a different technique.
Do I have to be loud?
No. A quiet 'voo' that you can feel vibrating in your chest works just as well; volume isn't the point.
Safety
Breathwork is a complement to (not a replacement for) professional medical care. If you have a heart, respiratory, or blood-pressure condition, are pregnant, or feel unwell, check with a clinician before practising breath-hold techniques.