What happens when you achieve the life change you thought you wanted—and still feel lost?

In this episode of Beyond Breath, Martin McPhilimey shares one of the most personal chapters of his life.

Seven months after moving from the UK to Western Australia, he was living with chronic hip pain, severe psoriasis, insomnia, anxiety and depression. Isolated on the other side of the world and increasingly disconnected from himself, he reached a point where he began questioning whether his life was worth continuing.

His way forward wasn’t a single breakthrough.

It began with small decisions: improving his health, changing how he ate, practising yin yoga, slowing down, looking inward and becoming more deliberate about how he connected with other people.

Martin also recounts a psychedelic experience at a rave that profoundly changed the way he thought about love, spirituality, compassion and contribution—and how he later began experimenting with those lessons in everyday interactions with patients, colleagues and strangers.

This is a story about moving from performing and seeking towards presence and contribution.

It’s also an invitation to consider two questions:

What is one choice you already know would support your health?

And what could change if you brought more genuine attention, warmth and care into the ordinary interactions you have every day?

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Content note: This episode includes discussion of depression, suicidal thoughts, alcohol and psychedelic drug use. These experiences are shared as part of Martin’s personal story and are not recommendations for treatment or drug use.

Breathing Anxiety, Air Hunger & CO₂ Tolerance: What Your Brain Is Predicting

Why does air hunger feel manageable for one person and threatening for another — even when their underlying breathing physiology may be very similar?

In this episode of The Breath Science Podcast, I explore the relationship between CO₂ tolerance, breathing anxiety, breathlessness and respiratory interoception — and why the way your brain interprets a respiratory sensation may matter just as much as the signal itself.

In breathwork and functional breathing, we often focus on breathing rate, tidal volume, CO₂ sensitivity, nasal breathing, respiratory mechanics and chemosensitivity.

These things matter.

But they may not completely explain why someone feels distressed by their breathing.

The brain does not simply receive information from the respiratory system. It also predicts what it expects those sensations to mean.

That distinction becomes particularly interesting when we look at air hunger and breathlessness anxiety.

Two people may experience a similar respiratory stimulus while having very different emotional responses to it.

In this episode, I explore research from Olivia Harrison and colleagues examining respiratory interoception, anxiety and breathlessness — including findings in endurance athletes that raise some fascinating questions about how repeated experiences of intense breathing may shape our predictions about respiratory discomfort.

We explore:

• What respiratory interoception actually means
• The difference between respiratory sensitivity and perception accuracy
• Why breathing anxiety does not necessarily mean you detect respiratory changes more accurately
• How predictive processing may influence the experience of breathlessness
• CO₂ sensitivity and chemosensitivity
• Why endurance athletes may experience greater anxiety around maximal breathlessness
• The difference between breathlessness intensity and breathlessness unpleasantness
• How anticipation can influence respiratory sensations
• Why exposure to air hunger alone may not reduce respiratory anxiety
• CO₂ tolerance versus air hunger tolerance
• Why safety, control and context may matter when training respiratory discomfort

One of the central questions I explore is:

What if the problem isn’t always the respiratory signal, but what the brain has learnt that signal means?

Rather than only asking, “How can we improve CO₂ tolerance?”, perhaps we also need to ask whether someone can experience air hunger while remaining regulated, safe and in control.

Because breathing is not simply a mechanical event.

It is also a sensation, a prediction, an interpretation — and it carries meaning.

If you work in breathwork, breathing retraining, respiratory science, sports performance, anxiety, rehabilitation or human physiology, this is an area of breathing science that deserves far more attention.

I'm Martin McPhilimey, a respiratory and sleep scientist and founder of the School of Breath Science.

I help health-driven people — and the coaches, therapists and practitioners who guide them — separate real breath science from wellness hype, drawing on more than 15 years across clinical, academic and coaching settings.

Free guide: How to Spot Manipulation in Breathwork Marketing
https://masterclass.schoolofbreathscience.com/checklist

Get certified with BRIT or the Breath Science Certification:
https://www.schoolofbreathscience.com/courses/

Join the free School of Breath Science community:
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This podcast is for educational purposes only and is not a substitute for individualised medical or clinical advice.

I walked out of my final clinical assessment convinced I had passed.

Months later, the result arrived: fail.

In Episode 2 of Beyond Breath, I share the mistake that caused that result — incorrectly dating a clinical report — and why the experience changed the way I think about competence, resilience and failure.

The deeper lesson wasn’t simply that failure makes us stronger. Failure does not automatically teach us anything.

What matters is whether we are willing to examine the gap between what we expected to happen and what actually happened — and update our approach accordingly.

I explore this through three very different environments: clinical training, Brazilian Jiu-Jitsu and entrepreneurship.

Jiu-Jitsu gives immediate feedback when something in your technique fails. Business is harder: the feedback can be delayed, ambiguous and noisy. Both raise the same question:

Are you using an unsuccessful result to update your approach, or using it to confirm a story about yourself?

In this episode, we explore:

• The clinical assessment I was convinced I had passed
• The documentation error that exposed a blind spot in my competence
• Failure versus learning from failure
• Prediction error and unexpected outcomes
• Resilience, adaptability and recovery
• Why deliberately exposing weaknesses can accelerate learning
• Lessons from Brazilian Jiu-Jitsu
• The uncertainty of entrepreneurship
• Productive and unproductive responses to failure
• Why being willing to look inexperienced is part of developing mastery

Want to compare breathwork training programmes more critically?

Get the free Breathwork Training Standards Checklist:
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A powerful breathwork session can create insight, emotional release and a meaningful shift in state.

But what happens when Monday morning arrives?

In this episode of The Breath Science Podcast, I explore the difference between facilitating a breathwork experience and working with someone longitudinally as a practitioner.

Through the story of Julian, a high-performing professional struggling with anxiety, poor sleep and mounting pressure, I show why insight alone does not always create behavioural change. Sometimes a breakthrough opens the door, but the person still needs the skills, capacity and structure to know where to go next.

We explore:

• The difference between a breathwork facilitator and a practitioner
• Why a powerful experience does not automatically create lasting change
• How insight can sometimes increase distress when there is no clear path forward
• Why assessment should come before intervention
• How to separate physiological, cognitive and behavioural components of anxiety
• Why poor sleep, recovery and low capacity may need addressing before deeper psychological work
• The role of breathing as an assessment tool, regulation skill and resilience practice
• Why the breath can remain central without becoming the only intervention
• How restoration, regulation, resilience and reappraisal can provide structure for longer-term work
• Why the intervention should follow the person rather than forcing the person into a technique

This is not an argument that facilitators are bad and practitioners are good.

A skilled breathwork facilitator can create a safe and genuinely meaningful experience. But practitioner work asks a different set of questions:

Who is this person?
What is actually happening?
What do they need?
Where should we begin?
How will we know whether it is working?
And how does today's intervention connect to where they need to go next?

Because the goal is not simply to create a powerful experience.

It is to create meaningful change that still holds when Monday morning arrives.

For years, I’ve been known for breath science. But what happens when the thing you become known for starts to feel like a cage?

Welcome to Beyond Breath, a new series within The Breath Science Podcast where I step outside the usual science-led conversations and explore the wider ideas shaping my work, business and life.

In this first episode, I talk about how I became “the breathing guy”, why specialising can slowly become an identity, and the tension between having a clear niche and allowing yourself to evolve.

I also share what Brazilian Jiu-Jitsu has taught me about ego, failure, competition and becoming a beginner again. After years of academic and professional expertise, BJJ gave me an environment where knowledge meant very little, failure was immediate, and improvement required becoming comfortable with uncertainty.

In this episode, I explore:

• How I became known for breath science
• When expertise starts becoming identity
• The commercial reality of being known for one thing
• Why I started Brazilian Jiu-Jitsu
• Ego, losing and learning through failure
• What uncertainty can teach us about learning
• Business, fatherhood, behaviour, psychology and the parts of my life that sit beyond breathing
• Why I’m creating the Beyond Breath series

Breath science remains at the centre of my work. It just doesn’t need to remain the boundary of my thinking.

Beyond Breath is the more raw and personal side of the podcast. Sometimes that will mean business, BJJ, fatherhood, identity, psychology, behaviour or entrepreneurship. Sometimes I may finish an episode with more questions than answers.

If that sounds like your kind of conversation, follow The Breath Science Podcast so you don’t miss the next episode.

The Breath Science Podcast | Beyond Breath #1

I’m Martin McPhilimey, a respiratory and sleep scientist and founder of the School of Breath Science. I help health-driven people, and the coaches, therapists and practitioners who guide them, separate real breath science from wellness hype, drawing on more than 15 years across clinical, academic and coaching settings.

🎁 Free Guide: How to Spot Manipulation in Breathwork Marketing
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This podcast is for educational purposes only and is not a substitute for individualised medical or clinical advice.

Your breath changes with your emotions. Stress, frustration and anxiety can make breathing faster, more irregular and more effortful. But the relationship also works in the opposite direction: changing how you breathe can influence the physiological state in which those emotions are experienced.

In this episode of The Breath Science Podcast, I break down how breathing interacts with the nervous system, carbon dioxide, heart rhythm, interoception, attention and physiological arousal.

Importantly, breathing is not a magic switch for turning stress or anxiety off. Different techniques affect different people in different ways, and sometimes focusing on the breath can actually make things worse.

We explore:

• Why stress and anxiety change the way you breathe
• How over-breathing and falling CO₂ can amplify uncomfortable sensations
• Why “take a deep breath” isn't always good advice
• How breathing influences heart rhythm and blood pressure regulation
• The role of interoception and how the brain interprets respiratory sensations
• Why breathing techniques can help organise attention during stressful moments
• When focusing on the breath may increase anxiety rather than reduce it

I also walk through three practical breathing techniques:

1. Extended exhalation breathing
A gentle way of reducing breathing pace and supporting a calmer physiological state.

2. Resonant or coherent breathing
Around six breaths per minute to create a smooth rhythm between breathing, heart rate and blood pressure regulation.

3. Box breathing
A structured breathing pattern that can be useful for focus and composure under pressure.

We also cover some of the most common mistakes people make, including breathing too deeply, slowing the breath too aggressively, forcing long exhalations and using breath control to avoid difficult emotions.

The goal isn't to find the “best” breathing technique.

It's to understand your current state, understand what different techniques actually do, and learn to select the right tool for the right moment.

Martin McPhilimey guides listeners into a gentle, non-striving grounding practice focused on safety, support, and allowing the breath to happen naturally.

It invites getting comfortable without needing the perfect posture or “right” breathing, then orienting to the room through sight, sound, and noticing the surface holding the body.

Attention is softly moved between the external environment and one point of bodily contact to build presence without pressure. With eyes closed or open, listeners observe breathing without changing it, recognize and thank the part that wants to control, and focus on the exhale as a small release.

The practice encourages trusting the body to breathe, relaxing effort by 1% in tense areas, repeating supportive phrases, widening awareness to include both body and room, and ending by noticing any small sense of settling before returning to the day.

Enjoy.

School of Breath Science

If breathwork for performance worked the way it’s commonly taught online, most people practicing it would be performing better — not feeling more stressed, fatigued, or confused about their breathing.Yet I regularly see athletes, coaches, and high-performers who’ve tried CO₂ tolerance training, hypoxic breathing, nasal breathing, breath holds, and “breath control” — only to feel worse, not better.In this episode I explain why that happens.We’ll break down the most popular breathwork concepts used for performance and endurance, how they’re typically taught on social media and short courses, and how the science and clinical reality actually reframes them.In this video, you’ll learn:Why CO₂ tolerance is often misunderstood — and why forcing breath holds can increase stressThe critical difference between tolerance vs capacity when it comes to air hungerWhy air hunger is perceptual and emotional, not just chemicalThe truth about hypoxic breathing and EPO (and why most protocols aren’t realistic or useful)Why breathing during exercise is an output, not an inputHow forced breathing patterns can increase cognitive load and reduce coordinationWhen nasal breathing helps — and when it becomes a constraintWhy hypoxic sprints and breath holds often cause overload, not adaptationThe real role of inspiratory muscle training vs breath holdsWhy over-breathing is primarily a nervous system response, not a CO₂ problemBreathwork for performance isn’t about forcing calm, controlling breathing, or chasing physiological shortcuts.It’s about sequencing stress correctly, understanding how the nervous system interprets demand, and letting efficient breathing emerge naturally.About this channelMy name is Martin McPhilimey.I’m a respiratory and exercise physiologist and the founder of the School of Breath Science.On this channel, we don’t teach breathwork as tricks or techniques to override the body.We teach breathing through physiology, nervous system regulation, and performance science, understanding breath as an output of the system — not something to micromanage under stress.If you’re interested in evidence-based breathwork, performance physiology, and nervous system-led training:👉 Subscribe to the channel👍 Like the video if it helped reframe your thinking👉 Join our community: http://schoolofbreathscience.com/community👉 Follow us on Instagram: http://instagram.com/schoolofbreathscienceSubscribe for regular insights, practices, and deep dives into the science of breathing.

If you spend any time in the breathwork or nervous system space, you’ve probably heard terms like coherent breathing, resonance, HRV, and the so-called “magic” six breaths per minute — often used interchangeably.They are not the same thing.In this video, I break down the critical physiological difference between coherence and resonance, why resonance is dynamic and individual, and why prescribing a single breathing rate can oversimplify nervous system regulation.You’ll learn:- What coherent breathing actually is — and why it works at a population level- Why 6 breaths per minute is an average, not a target- What resonance really means from a cardiovascular and baroreflex perspective- Why resonance is context-dependent and changes day-to-day- Why subjective calm does not always equal physiological efficiency- Why live biofeedback (HRV) is required to accurately identify resonance- The difference between compliance and adaptation in nervous system trainingThis isn’t about chasing relaxation or forcing calm.It’s about working with the nervous system at the frequency where it naturally self-regulates most efficiently.If you’re a coach, practitioner, or someone interested in the science of breathing and HRV — this distinction matters.Let me know if you’d like a deeper dive into:- HRV interpretation- Baroreflex oscillations- Practical assessment methods using live biofeedbackI’ll cover that in the next video.At the School of Breath Science, we teach how the breath can be used as a tool for stress resilience, improved wellbeing, and peak performance. Our mission is to raise the standard of education in breathwork by combining cutting-edge science with practical, accessible training that empowers you to transform your health and support others.Whether you’re curious about the physiology of breathing, exploring nervous system regulation, or looking for strategies to boost energy and focus, you’ll find resources, community, and support with us.👉 Join our community: http://schoolofbreathscience.com/community👉 Follow us on Instagram: http://instagram.com/schoolofbreathscienceSubscribe for regular insights, practices, and deep dives into the science of breathing.#HRV #HeartRateVariability #HRVScience #CoherentBreathing #ResonanceBreathing #ResonantFrequency #BreathingScience #PhysiologyOfBreathing #SlowBreathing #NervousSystemRegulation #AutonomicNervousSystem #ParasympatheticNervousSystem #VagusNerve #Baroreflex #RespiratorySinusArrhythmia #Biofeedback #HRVBiofeedback #StressPhysiology #AdaptiveRegulation #ResilienceTraining #BreathworkScience #EvidenceBasedBreathwork #AppliedPhysiology #BreathCoach #BreathEducation #ClinicalBreathwork #SchoolOfBreathScience

The Wim Hof Method has become one of the most widely practised breathwork and cold exposure protocols in the world — often promoted as a way to improve stress resilience, mental health, immune function, and performance.

In December 2025, researchers published the largest and most rigorous scientific study to date on the Wim Hof Method, involving 404 participants and, crucially, comparing it against mindfulness meditation as an active control — not a placebo, but a proven intervention for stress and anxiety.

In this episode, I break down what the study actually found, what is commonly misunderstood, and why interpretation matters just as much as results.

You’ll learn:

• Why this study represents a step change in Wim Hof research

• What the researchers measured across psychology, cognition, physiology, and sleep

• The critical difference between state change and trait change

• Why “statistically significant” does not always mean clinically meaningful

• What the findings do — and do not — support about nervous system regulation

• Whether hyperventilation is truly necessary for the observed benefits

This is not a critique of the Wim Hof Method.It’s an evidence-informed interpretation grounded in respiratory physiology, nervous system regulation, and clinical relevance.

If you’re interested in breathwork, cold exposure, stress resilience, or learning how scientific research is often misrepresented online, this episode will help you understand the nuance clearly.

I’m Martin McPhilimey, respiratory and sleep scientist and founder of the School of Breath Science, where we focus on physiology, psychology, and context — not hype.

👉 Join the community: ⁠https://schoolofbreathscience.com/community⁠👉 Follow on Instagram: ⁠https://instagram.com/schoolofbreathscience⁠

Subscribe for regular evidence-based discussions, practical insights, and deep dives into the science of breathing and nervous system regulation.

00:00 Why the largest Wim Hof study matters

01:45 What makes this study different

03:10 What the researchers actually tested

05:00 State change vs trait change

07:20 Cognitive and physiological findings

09:30 Why respiratory rate results are misunderstood

11:20 Is hyperventilation necessary?

13:00 Interpretation and practical implications

14:30 Key takeaways

#WimHofMethod

#BreathworkScience

#ColdExposure

#NervousSystem

#StressResilience

#BreathingPhysiology