Anecdote or Evidence?
What 1,148 breathwork
experiences reveal
A 2025 brain scan captured what connected breathing does: CO₂ drops, blood flow to the self-monitoring brain falls by roughly 40%, the inner-critic network quiets, and the emotion-and-memory centres light up. We then read 1,148 first-hand accounts from our community, and people independently described that exact cascade, tetany and all, usually before anyone explained the science to them.
One story is an anecdote. A thousand matching the mechanism is a pattern.
What this shows
The experience is real, it repeats across strangers, and the involuntary physical signs line up with a measured mechanism.
What it doesn’t
It isn’t a controlled trial and doesn’t prove breathwork treats any condition. Accounts are self-selected, and individual results vary.
Contents — jump to a section
- The trouble with “just anecdotes”
- What we did with the stories
- How it actually works
- What’s actually been measured
- What our community reports
- Where the science & stories line up
- Why the change outlasts the session
- Why the session is built this way
- The safety question
- What this proves, and what it doesn’t
- Where the doorway leads
Stacy finished a session, still catching her breath, and wrote down what her body had just done:
It felt like years of fear and anxiety I’d been carrying in my solar plexus were finally being given permission to move.Stacy, 9D community
No theory in that sentence. No neuroscience. She’d read none of it; she was just reporting a feeling.
The reason her line is worth stopping on is what happened in a lab the year before she wrote it. In 2025, researchers at a UK medical school put people inside an MRI scanner and watched connected breathing unfold in real time. If you knew what that scan showed, you could more or less predict the language people would reach for afterward. Stacy reached for it without ever seeing the study. So did hundreds of others in our community.
That overlap is what this piece is about. Not one dramatic story, but the pattern sitting underneath a thousand of them.
The trouble with “just anecdotes”
For years the criticism of breathwork was a fair one: it’s all anecdotes. People come out of a session lighter, calmer, changed in some way they struggle to name, and “I feel amazing” is not evidence of anything. A single story can be a fluke or a good day or the placebo talking. Anyone asking for more than a testimonial has a point.
So we tried asking the question a different way. What if you stopped treating the stories as one-offs and started treating the whole pile of them as data?
We have thousands of first-hand accounts sitting around: wins people posted in our community, reviews, recorded video testimonials. On its own each one is exactly what the critic says it is. But sort them, count them, read them side by side, and they turn into something more useful than any of them is alone. They become a record of what a lot of independent people say happens to them, in their own unprompted words, usually well before anyone has explained the mechanism to them.
None of that proves cause and effect. Only a controlled trial can do that, and we’ll keep saying so. What a record like this can do is show you two things a lone story can’t: whether the experience is consistent from one person to the next, and, for the parts that are physical and involuntary, whether what people describe actually matches what the lab measured. On both counts, it does, more closely than we expected.
What we did with the stories
We pulled 1,148 first-hand accounts from our community, cleared out the duplicates, and read every one. Each got tagged twice: once for the outcome the person described (calmer, less anxious, grief released, sleeping again), and once for the physical thing they reported feeling mid-session (crying, tingling, shaking, a sense of unity, heat in the body). Then we set those tallies next to what the published science says the body should be doing during this kind of breathing.
That’s the whole of it: a structured look at what real people keep reporting, held up against a measured mechanism.
How to read the numbers (and what they aren’t)+
This isn’t a clinical trial, and the counts further down are not incidence rates. There’s no control group. Every account came from someone who chose to write about their session, which stacks the deck heavily toward people who had a strong one.
So when we say ninety-four accounts described feeling lighter, read that as a count inside a pile of volunteered stories, not a forecast that some fixed share of everyone who breathes will feel it. Nobody’s blood chemistry got measured. We’re holding the figures loosely and leading with the human version of each.
And we’re not claiming this proves breathwork treats or cures a thing. With this data alone we can’t, and we won’t pretend otherwise. The claim is smaller: what people describe feeling, especially the involuntary parts they didn’t see coming, tracks the mechanism the science has started to measure.
How it actually works
The mechanism first, because once it clicks the reports stop sounding mystical and start sounding almost predictable. Most people assume the whole thing runs on getting more oxygen in. It doesn’t. The active ingredient is carbon dioxide going out.
Breathe in a fast, full, connected rhythm (no pause between the inhale and the exhale) and you blow off CO₂ quicker than your body can make it. CO₂ isn’t waste your body is glad to be rid of. It works more like a dial, and one of the things that dial controls is how wide the blood vessels in your brain sit open. Drop the CO₂ and those vessels ease shut a little. Blood flow to the thinking brain drops with them. In the 2025 scans it fell by roughly forty percent at the peak.
The network that runs your endless self-monitoring (the inner commentary, the low background hum of self-criticism and rumination) quiets down for a while. Neuroscientists call it the default mode network. Picture it as the guard posted at the door of your mind, and picture the guard stepping away for a few minutes. Whatever you’d been keeping out there walks in. On the scan, blood flow falls in the region that builds your everyday sense of being a separate self, and rises in the parts that handle emotion and memory. The watchtower dims and the feeling brain wakes up in the same breath.
What’s actually been measured
We didn’t dream this chain up. Three published sources hold it up, and each carries a different amount of weight.
Kartar et al., 2025: real-time MRI
A UK medical-school team watched connected breathwork as it happened: CO₂ dropping from ~35–40 to 20 or below, cerebral blood flow falling ~30% early and 42% at peak, and the further blood flow fell in the body-sensing region, the stronger people rated their sense of unity and bliss. The authors put the intensity in the range of a moderate dose of a classic psychedelic, with no drug involved.
Published · peer-reviewedHavenith et al., 2025
A second team, same year, came at it independently and landed on the same culprit: it’s the CO₂ falling, not oxygen, that tips you into the altered state. Two papers, two labs, one mechanism, twelve months apart.
Published · same-yearEyerman, 2013
A psychiatrist ran connected breathwork with something like eleven thousand psychiatric inpatients across roughly twelve years and logged no serious adverse reactions. In the right room, with the right support, this sits at the low-risk end.
Clinical reportThere’s already a name for that unity state, and it isn’t ours. Psychedelic researchers call it Oceanic Boundlessness, the sense of the wall between you and everything else going soft, and it comes off a standard questionnaire used across that field. Borrowing their word for it keeps us honest and stops us inventing our own vocabulary for something already described.
We’ll keep being straight that the science on multi-element work like ours specifically is still coming together. The core physiology underneath it, though, is no longer guesswork.
What our community reports
Start with outcomes: the change people said they were left with. The two biggest groupings had nothing clinical about them.
Trailing clusters, in descending order. Counts are tallies inside volunteered stories, not a survey of everyone who ever tried it.
What floats to the top of people’s own words is catharsis and calm, feeling something shift and settle, far more than any tidy list of symptoms. Which is exactly the direction the mechanism points: quiet the guard, wake the feeling brain, and whatever’s been held down comes up and moves.
The more interesting half is the physical stuff: the involuntary things people felt happening while they were still breathing, the events nobody sets out to have.
Conservative tallies across the community accounts; we only counted posts that named the sensation in plain words, so the true figures run higher. The rarer signs (tetany, spontaneous movement) matter most: they are involuntary, and people report them without knowing what they are.
The tetany line is the one to sit with. Tetany (the hands and fingers curling and stiffening up) is a specific, well-understood response to the shift in blood chemistry that over-breathing produces. Nobody invents it to sound profound. It’s odd and a bit uncomfortable, and most people who get it have no clue what it is until someone explains. A report like that carries weight.
And our numbers do not stand on their own. The largest clinical record of this kind of breathwork, gathered in a psychiatric hospital over twelve years, points the same way.
A large, screened clinical population, most of whom had never done breathwork before, and most of whom reported profound, boundary-dissolving experiences with not one adverse reaction. Where that record counts a transpersonal experience, our own community reports the same sense of unity in its own words.
Where the science and the stories line up
Take the obvious objection first. The scanner reads Oceanic Boundlessness partly through a questionnaire, through people reporting a felt sense of unity. So when our members also report unity, that’s the same subjective thing showing up in two places. It’s consistent, and consistency is worth having, but it isn’t the stories confirming the biology from the outside.
The outside confirmation lives in the body. Tetany. Hands pulling into claws. Arms that lift and move on their own. Those are involuntary. People report them without knowing what they are, without any expectation they’d happen, with no idea a paper somewhere predicts them.
My arms began waving and moving on their own, and I experienced some tetany in my hands… Later my hands began moving above different areas of my body, sometimes quickly, sometimes sweeping, as though something had taken over that knew exactly where to go.Victoria, first facilitated session
She isn’t groping for neuroscience. She’s describing tetany and spontaneous motor release, two things the mechanism calls for, exactly as they landed on her.
And the match is not only to the scanner. Long before any of this was imaged, the framework of human catharsis had already catalogued the same involuntary signs: grief discharging as tears and sobbing, fear as trembling, anger as storming movement of the limbs. The 2025 scan predicts these signs from blood chemistry; a clinical model from the 1970s predicts the same signs from the emotion being released. Two independent frameworks, decades apart, describing one set of fingerprints.
The scan has the emotion-and-memory centres lighting up as the thinking brain fades; the community has this:
At the end of day 5 I started crying like a little baby. I had no idea why, but it was exactly what I needed.9D community member
Then the payoff the mechanism promises: release followed by relief. Watch three people who’ve never met reach for nearly the same phrase.
I felt the tension leaving my body and the anxiety leaving my mind. I feel so much calmer and lighter.Kira
I had lost eleven people in two and a half years. It all poured out of me. I felt as though my body had finally been given permission to let go of the grief it had been carrying.Victoria
Permission to let go. Permission to move. Strangers, separately, landing on the same image for the same internal event. That’s what consistency looks like when it happens at scale. The subjective reports buy you consistency; the involuntary physical signs are the ones that corroborate the biology from the outside. Both are worth having; we’d just rather not pass the first off as the second.
Why the change outlasts the session
Even if the breath props a door open for twenty minutes, why would anything be different the next morning, let alone a year on? Part of the answer is neuroplasticity: the brain lays down new wiring fastest when someone is emotionally moved and feeling safe at the same time, which is precisely what a session sets up. The other part is about attention.
Trauma tends to leave the nervous system stuck on a survival setting, scanning for the next threat long after the threat has gone. You’ve felt a harmless version yourself: buy a red car and within a week every third car looks red. Nothing changed out there; your brain’s filter changed. Set that filter to hunt for danger and it will find danger everywhere, for as long as it’s left running. What breathwork seems to do, session after session, is give the nervous system enough real experiences of safety that the setting itself begins to move.
In 1972 she was a naïve seventeen-year-old when a stranger who seemed kind drew her away from a crowd and into a room that locked from the inside. She got out. Her body, in a sense, never did. The hypervigilance that set in that day, as she puts it, “never went away, until my first breathwork journey.” For five decades her filter stayed jammed on threat.
I couldn’t take an elevator with a man in it. Before bed I had to check every inch of the house, under beds, in closets, so I’d know no one was hiding, waiting for me. I always carried something, keys, sometimes a wrench, ready to defend myself.
She raised two daughters inside that vigilance. The line that lands hardest, though, isn’t about the fear itself: “I think there was a big part of me that didn’t know this was not normal.” That is the filter, exactly. When it’s set to danger, danger doesn’t feel like a distortion; it feels like the world.
Cheri had done the other work for years: counseling, medication, retreats. It helped her mind. What it hadn’t reached was the body still living in that room. A breathwork session let the survival charge she’d carried since seventeen finally move and discharge, and then let her whole system settle.
Breathwork reconnected me to my body, and let me forgive my attacker and, most of all, myself. I can be in small places now. I don’t fear men. I see beauty, I see people who are kind. I’m getting to know Cheri again, and that, to me, is a miracle.
This is one woman’s account, sitting alongside years of professional support, not a claim that breathwork treats trauma on its own. But if a nervous system can re-tune after fifty years, the door is open to very nearly anyone.
Why the rest of the session is built the way it is
If the breath opens the door, everything else in a 9D session exists to make good use of what comes through it, and each piece answers to something people report. With the guard down, the mind stops arguing and starts taking things in, which is why the spoken guidance lands as insight rather than instruction: the breath tills the soil and the words are the seed. Music moves emotion and pulls on the brain’s reward chemistry. The sound frequencies work like a metronome the brain can fall in step with: cruise control for the state rather than the engine of it. The holds open a pocket of stillness where whatever surfaced finally gets room to be felt. And the release, sometimes a sound or a scream, never required of anyone, is where the people with the most powerful accounts tend to say the shift finished landing. Stir it up, meet it, let it out.
There is a reason the words weigh as much as the breath. In one of the more careful studies of emotional release, cognitive insight that arrived without an accompanying physical discharge did not just fail to help; it raised physiological tension, with people reporting they felt worse than when they began. Discharge without insight, in turn, rarely holds. Catharsis, as that literature carefully puts it, is necessary but not sufficient: the breath opens and discharges, the guidance turns what surfaces into something a person can understand and keep, and one without the other is half a session.
The safety question
The sources line up on safety too. Eleven thousand inpatients, no serious adverse reactions across a decade-plus. The 2025 imaging study, no adverse events. In our own accounts the physical signatures people describe (the tingling and tetany and the wave of emotion and the shaking) are the ordinary, self-limiting responses to shifted blood chemistry rather than signs anything’s going wrong. Our first structured school pilot, tracked on validated wellbeing questionnaires, reported none either.
Honesty runs both ways, though. This is intensive work, and the release it opens can occasionally be large and go on for a while. It isn’t for everyone; some medical and psychological conditions call for adjustments or rule it out altogether. That’s the whole case for trained facilitation and proper screening. A big release is far better met with someone in the room than on your own, and it’s why we treat this as a companion to professional care and never a substitute for it.
So: anecdote, or evidence?
Neither, quite, and something more interesting than either. One story is an anecdote, no argument. But a thousand of them, independently describing the same involuntary physical signs a brain scanner predicts in advance, have stopped being anecdotes and become a pattern. And the pattern has a mechanism underneath it that you can measure.
None of which proves breathwork treats anything. What it does is show that the thing people feel is real, that it repeats, and that it can be explained.
Most of us spend most of our lives on autopilot, riding along in a car we’re technically driving. What the breath seems to do, for a few controlled minutes, is put your hands back on the wheel: it quiets the part of the brain that watches and judges, wakes the part that feels and remembers, and gives whatever you’ve been hauling around a chance to move.
The scanner records that as a drop in blood flow. A thousand-odd people record it as breathing freely again, as a weight set down after years, as arms moving on their own and grief that’s finally allowed out the door.
One doorway. Measured two ways.
The experience is the doorway, not the destination.
Where the doorway leads
So what does all of this add up to in a room, with headphones on? The science points at one specific thing the breath does. Connected breathing lowers CO₂, blood flow to the self-monitoring brain drops, and the door we have been describing swings open. That part is the engine. It is also the part most practices stop at.
Talk therapy works with the thinking brain, the same network the scan watches go quiet, and insight that lands there without ever reaching the body can leave the knot exactly where it was. Meditation edges toward the doorway slowly. Plain breathwork can open it and then leave you alone in the room. 9D is built the other way around: the breath opens the door, and the other eight layers, the music, the frequencies, the guidance, the pockets of stillness and release, are there to make use of the open door while it lasts. That is the whole reason for the design, and it is the most plausible explanation for the thing people keep telling us, which is that it reached somewhere their other work had not.
We hear it most often from the people who had already tried a lot.
“I’ve done a ton of modalities, and nothing hits as deep and as powerful as this.”
Kerri, participant & facilitator“Nothing has ever reached this deep. I noticed the change by day three: I walked through a whole retail day with inner peace and calm, totally present.”
Leigh, 5-day challenge“The depth of relaxation was a level I had never experienced, and that was only the tip of the iceberg. The inner enquiry and healing were completely unexpected.”
Simon“I came to 9D three years ago, and it was the answer to my biggest question: how to heal from decades of trauma.”
ElizabethOne facilitator described a man who had practised intensive breathwork for ten years. After a single 9D journey he was speechless, and said he had never experienced anything like it.
References & further reading
Every figure quoted above traces back to one of these.
Read the study →
Read the study →
Read the report →
Read the review →
Available on request
Read the essay →
Read the thesis →
Individual results vary. The experiences here are reported participant experiences, lightly edited for length and clarity and used with permission, with names reduced to first names only for privacy; they shouldn’t be read as guaranteed results. 9D Breathwork is for personal growth and wellbeing and is not a substitute for medical or psychological treatment. Anyone with a serious medical or mental-health condition should talk to a qualified healthcare provider before taking part.
