The Power of Vooing and Rocking.
Somatic practices to increase capacity
"Talking about a traumatic experience... can convey a defense against feeling. Nonverbal therapies help people feel what they feel, notice what they notice, and observe how things flow inside them."
— Bessel van der Kolk, MD
Shifting Your Body State
Long before anyone had language for the vagus nerve, bodies already knew how to calm themselves — a low hum on the exhale, a gentle sway back and forth. These two motions are some of the oldest, simplest tools we have for telling an overwhelmed nervous system: you're safe now.
Your body has a built-in off switch for panic. It just needs the right signal.
According to Polyvagal Theory, developed by neuroscientist Dr. Stephen Porges, your autonomic nervous system is constantly scanning for cues of safety or danger and shifting your body's state in response — into fight-or-flight, into shutdown and freeze, or into a calm, connected "rest and digest" state.
Vooing and rocking are two of the most direct, low-effort ways to send your body a cue of safety. One works through sound and breath. The other works through rhythm and movement. Both speak a language older than words — which is exactly why they work when thinking your way out of overwhelm doesn't.
Practice One: Vooing
Toning the Vagus Nerve with Sound
A slow exhale on a low "voo" sound, felt in the belly rather than the throat.
The "VOO" exercise comes from Dr. Peter Levine, founder of Somatic Experiencing®, who developed it as a way to help people move out of freeze and shutdown states and back into a felt sense of aliveness. The instruction is simple: take an easy, full breath, and on the exhale, let out a low "voo" sound — as though it's rising from your gut, not your throat.
It isn't singing and it isn't performance. It's closer to the sound of a foghorn, or a cow calling across a field — a vibration you let your body make, then notice what shifts.
"The idea is to take an easy full breath and, on the exhalation, make the sound 'voo' as though it's coming from the gut. Vibrate the voo sound in your gut and let the sound and the breath go all the way out."
— Dr. Peter Levine, founder of Somatic Experiencing
Why it works:
It tones the vagus nerve directly. The vagus nerve — the body's main "rest and digest" pathway — runs from the brainstem through the throat, chest, and gut. Long, vibrating exhales physically stimulate its auricular and visceral branches, nudging the body out of high alert.
Humming measurably lowers stress. A 2023 heart-rate-variability study found humming produced the lowest physiological stress index compared to physical activity, emotional stress, and even sleep — a sign of active parasympathetic engagement. See the study at: pmc.ncbi.nlm.nih
The exhale itself is the signal. Exhaling longer than you inhale is one of the most reliable ways to cue safety to the nervous system — the voo sound simply makes that long exhale slower, fuller, and easier to sustain.
How to practice:
Find stillness. Sit or lie down somewhere you won't be interrupted. Let your shoulders drop and your jaw soften.
Take one easy, full breath. Inhale through the nose, filling belly and chest without straining.
Exhale on a low "voo." Let the sound come from your gut, not your throat. Ride the exhale all the way to empty.
Let the next breath arrive on its own. Don't force the inhale — allow it to fill you naturally before the next voo.
Repeat 3–5 times, then pause. Notice sensations, temperature, or images that arise. There's no need to interpret them — just notice.
Practice Two: Rocking
The Rhythm the Body Already Knows
A slow, steady sway — side to side, or back and forth — that your body has trusted since before you could walk.
Rocking is one of the most universal self-soothing behaviors humans have — appearing in the majority of babies by nine months old and persisting, in quieter forms, throughout adulthood: the sway on the edge of a bed, the settle into a hammock, the unconscious rock of a body deep in thought or grief.
It isn't a coping mechanism to grow out of. It's a physiological strategy the body reaches for because it works — offering rhythm and predictability to a system that's looking for exactly that.
"Rocking activates the vestibular system... Predictability tells the brain, 'Nothing new or threatening is happening right now.'"
— VOA Northern New England, on the neuroscience of rocking
Why it works:
It stimulates the vestibular system. Rocking engages the balance organs of the inner ear, which are directly wired into the brainstem and into circuits governing mood and emotional regulation — not just spatial orientation.
It calms the oldest part of the brain. The brainstem — where survival responses like fight, flight, and freeze originate — is soothed by steady, patterned, repetitive movement, helping the body settle without needing to think its way there.
It's measurably supported by research. A veteran-focused study found rocking-chair use helped participants self-soothe and reduce cravings tied to stress. Studies in older adults have shown rocking lowers anxiety and improves postural stability.
How to practice:
Choose your setup. A rocking chair, the edge of a bed, a cushion on the floor, or simply standing — any position where gentle sway is possible works.
Start almost imperceptibly small. Begin with a barely-there sway. There's no need to move far — the nervous system responds to rhythm, not amplitude.
Let your own pace emerge. Some bodies want a slow rock; others want something quicker at first. Follow what feels steadying, not performed.
Let your breath match the motion. Notice if your breathing starts to sync with the rhythm on its own — this is often where the calming effect deepens.
Continue for a few minutes, then rest. Let the movement slow and stop on its own. Sit in the stillness that follows before returning to the day.
Closing
These are tools. Sometimes the work needs a witness.
Vooing and rocking are practices you can begin on your own. When your nervous system is carrying more than a page can hold, somatic therapy and acupuncture offer a slower, guided way through — with attentive, individualized care rooted in the body's own wisdom.
Sources
"One of the keys in working with trauma is to touch into difficult sensations one small amount at a time, and let the energy come to equilibrium."
— Dr. Peter Levine, founder of Somatic Experiencing