What breath actually does — and what it doesn't

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Breathwork has had a long moment. Pranayama, Wim Hof, Conscious Connected Breathwork, box breathing, physiological sighs — depending on which corner of the internet you're in, the breath is either a recovery tool, a performance enhancer, an immune booster, or a vehicle for emotional release. The breathwork evidence is uneven. Some of those claims are well-supported. Some are not.

This post is a short tour of what's actually known about breath, where the research is solid, where it's thin, and how we use breath at the studio when we're coaching. We don't run breathwork as a separate discipline. Breath is woven through what we already do — Pranayama in the Iyengar classes, breath cues during lifting, breath as a downregulation tool at the end of a hard session. Conscious Connected Breathwork comes up occasionally as a workshop, but it isn't part of the regular timetable.

Pranayama is the breath-control practice within yoga. The word translates as the extension (ayama) of breath or life force (prana). The category is broad — it includes alternate nostril breathing (Nadi Shodhana), Ujjayi (the soft-throated breath used in flowing yoga), and Kapalabhati (rapid forced exhalations sometimes called skull-shining breath).

What the evidence supports: slow nasal breathing — typically around six breaths per minute — has been shown to lower resting blood pressure in adults with mild hypertension, and produces measurable changes in heart rate variability. Different Pranayama techniques produce different physiological responses, which is to say: Kapalabhati is not a relaxation technique, even though it is sometimes taught alongside ones that are. The label Pranayama covers a wide range. The effects depend on the specific practice.

If you train with us in any of the Iyengar classes, Pranayama is part of what's taught. It isn't always called by name in every session, but the practice is there.

The Wim Hof Method combines a breathing protocol — typically three to four rounds of thirty to forty deep breaths followed by a breath-hold after exhalation — with cold exposure and mental focus. It is the most commercially marketed breath method of the last decade.

What the research actually shows: a 2014 study in PNAS found that practitioners trained in the method could voluntarily activate their sympathetic nervous system and attenuate the innate immune response to an injected bacterial endotoxin. That's a real and interesting finding. It is also a narrow one. It does not establish that the method "boosts immunity" in any general sense, or that practising it makes you less likely to get sick.

The breathing protocol itself induces respiratory alkalosis — a temporary drop in blood CO2 — which produces the tingling, light-headedness, and altered consciousness many practitioners describe as profound. That is a physiological effect, not a mystical one. It also means the protocol is not appropriate for everyone, and not appropriate to do in water, while driving, or before activity that requires balance. If you've seen warnings about this, they are not overcautious — they are accurate.

Conscious Connected Breathwork uses continuous circular breathing — no pause between inhale and exhale — sustained for twenty minutes or longer. Many practitioners describe profound experiences: emotional release, shifts in long-held states of mind, a sense of something moving that hadn't moved in a while. The reports are common enough, and consistent enough, to take seriously.

What's harder to explain is the mechanism. The story most often told — that CCB activates the parasympathetic nervous system — doesn't quite fit the physiology. Sustained over-breathing produces respiratory alkalosis: a temporary drop in blood CO2 that drives the sympathetic nervous system, not the parasympathetic. Whatever is happening in a CCB session, it isn't simply relaxation. It seems closer to an induced altered state, and what people make of that state — emotionally, therapeutically — appears to matter as much as the breathing itself.

That doesn't make the experience any less real for the people who find it valuable. It means the model used to describe it is probably incomplete. There's a difference between this doesn't work and we don't fully understand how this works, and CCB sits in the second category.

We host CCB workshops occasionally, run by visiting facilitators. It isn't part of the regular timetable. If you're curious, watch the events page.

Box breathing — inhale four, hold four, exhale four, hold four — is one of the simplest and most reliable breath tools we use. Slow, even breathing in the four-to-six-breaths-per-minute range engages the parasympathetic nervous system through the vagus nerve, a relationship reviewed in detail by Gerritsen and Band (2018) in Frontiers in Human Neuroscience. 

The effects are measurable: a slower heart rate, modest reduction in blood pressure, often a reduction in subjective stress.

You don't need a quiet room or a meditation cushion. You can do it sitting at a desk after a hard email. You can do it after the last set of a heavy lift, while the rest of the session resets. We use it with members who are working through anxiety or struggling to switch off after training. It works because the physiology is real, not because the practice is special.

When you lift, exhale on the effort. Inhale before, brace at the top of the breath, exhale through the hard part of the lift. This is not mystical. It's mechanical: the brace produces intra-abdominal pressure that stabilises the spine under load, and the timed exhale prevents the pressure from rising past where the cardiovascular system can comfortably handle it. You'll hear this cued regularly across Movement & Strength as well as Bone Defence classes.

In endurance work — running, rowing, riding — rhythmic nasal breathing where possible, switching to mouth breathing as intensity rises. Beyond that, the optimal pattern depends more on your training history than on any rule.

Use breath. It's a free, well-supported, low-risk tool for shifting state — calmer when you're wound up, focused when you're scattered. Slow nasal breathing works. Box breathing works. Both have real research behind them.

Be sceptical of the more dramatic claims. If a method promises to fix your immune system, your trauma, or your metabolism through breathing alone, you've probably wandered into marketing rather than evidence. The breath is a useful lever. It is not a shortcut.

If you train with us, you're already practising more of this than you might realise — in the Iyengar room, under the bar, and at the end of a session when the room goes quiet.

Infuse Health is a boutique movement and wellness studio at 4/10 William Street, Adamstown. You can start with a 4-week intro, a personal training session, or a single class — whatever fits what you're working with. Bookings through infusehealth.au.