Your breath.
Your balance.
Your transformation.
A natural method to relieve stress, anxiety and pain, boost vitality, strengthen the immune system and improve sleep, concentration and performance.
With Marc Romain (breathing & cold exposure instructor, 3 world records) and Matthieu Dubreucq (CrossFit Level 4 coach)
Read it online or download it to keep and share. No sign-up.
Access the free guidePDF in French · 82 pages · 29 MB Do any of these situations sound familiar?
Persistent fatigue, low energy levels
Difficulty regaining vitality despite rest.
Stress, anxiety
Constant inner tension, shallow breathing and a restless mind.
Irritability
Everything irritates you easily, and you lose patience without understanding why.
Anxiety attacks
Feelings of tightness, breathlessness or loss of control.
Performance at work
Difficulty staying focused, clear and effective over time.
Sports performance
Getting out of breath quickly, recovering slowly or struggling to find your rhythm during exercise.
Sleep disorders
Difficulty falling asleep, waking up at night or unrefreshing sleep.
Chronic pain
Muscle tension, backache or persistent diffuse pain.
Inflammation problems
Recurring physical discomfort, sensitive digestion or painful joints.
Decreased concentration
Scattered mind, difficulty staying present and focused.
Reduced motivation
Lack of momentum, loss of meaning or pleasure in your activities.
Feeling emotionally blocked
Suppressed emotions, difficulty expressing or releasing your feelings.
Weakened immune system
Frequent fatigue, repeated infections, loss of resistance.
Difficulty in recovering from exertion or illness
Slow to regain your usual energy level.
Lack of creativity
An overloaded mind, difficulty imagining, innovating or creating.
Lack of self-confidence
Recurring doubts, fear of taking action, feeling "out of breath".
Persistent fatigue, low energy levels
Difficulty regaining vitality despite rest.
Stress, anxiety
Constant inner tension, shallow breathing and a restless mind.
Sleep disorders
Difficulty falling asleep, waking up at night or unrefreshing sleep.
Decreased concentration
Scattered mind, difficulty staying present and focused.
Reduced motivation
Lack of momentum, loss of meaning or pleasure in your activities.
Sports performance
Getting out of breath quickly, recovering slowly or struggling to find your rhythm during exercise.
See more situationsShow fewer situations
Irritability
Everything irritates you easily, and you lose patience without understanding why.
Anxiety attacks
Feelings of tightness, breathlessness or loss of control.
Performance at work
Difficulty staying focused, clear and effective over time.
Chronic pain
Muscle tension, backache or persistent diffuse pain.
Inflammation problems
Recurring physical discomfort, sensitive digestion or painful joints.
Feeling emotionally blocked
Suppressed emotions, difficulty expressing or releasing your feelings.
Weakened immune system
Frequent fatigue, repeated infections, loss of resistance.
Difficulty in recovering from exertion or illness
Slow to regain your usual energy level.
Lack of creativity
An overloaded mind, difficulty imagining, innovating or creating.
Lack of self-confidence
Recurring doubts, fear of taking action, feeling "out of breath".
DISCOVER THE o2co2 MASTERCLASS
For professionals under pressure, athletes and anyone seeking well-being.
The masterclass is free: share it with your friends, colleagues and the people you care about.
THE o2co2 MASTERCLASS
Why our method works
We literally teach you how to access your nervous system and influence your hormonal responses according to your needs: regaining calm, increasing energy, improving concentration or speeding up recovery.
By rebalancing O₂ and CO₂ and stabilizing the body’s pH, you naturally soothe stress, reduce inflammation and improve circulation, oxygenation and vitality.
In this way, you become the alchemist of your own body: able to activate physiological states that transform your health, mental clarity and well-being, simply through the power of the breath.
THE o2co2 MASTERCLASS
The benefits you'll feel
Every breath brings you closer to a more aligned, efficient and balanced body and mind, whether in everyday life, at work or in sport.
For your everyday well-being
Regain energy and vitality
A lighter, toned and naturally replenished body.
Soothe your mind and reduce stress
Less tension, more calm and inner clarity.
Improve your sleep
Fall asleep more easily, sleep more deeply and wake up refreshed.
Release your emotions and tensions
A more supple body, a clearer mind, a freer inner space.
Increase your concentration and creativity
Sharper thinking, more fluid ideas, easier decision-making.
Strengthen your resilience and confidence
Facing challenges with stability, courage and serenity.
Boost your immune system and recovery
A stronger, more responsive and better protected body.
Improve your ability to self-regulate
Learn to return to equilibrium quickly, whatever the context.
For athletes
Performance optimization
More efficient breathing, better endurance, more power and faster recovery.
Reduce muscle tension
Smoother movements, greater body mobility and faster return to exertion.
Better effort management
Stay calm, clear-headed and effective, even during intense effort.
For work and professional life
Better concentration and productivity
Clear, focused mind and less mental fatigue.
Managing stress and difficult situations
More calm, perspective and lucidity, even under pressure.
Energy / recovery balance
Staying productive all day without exhaustion.
Faster, sounder decisions
A stable mind that sees more clearly and acts with precision.
Reducing absenteeism
Overall well-being, less tension and more stability in everyday life.
Improved team cohesion
More calm, conscious communication and natural mutual support.
THE MASTERCLASS FOR YOUR TEAMS
Our masterclass is available free on YouTube, with no registration required. Share it with your teams to introduce them to the method and support their practice.
For everyday practice, the o2co2 app offers two free breathing exercises, with a Premium option for more exercises and features. It is available on the App Store; the Android version is coming soon.
THE o2co2 MASTERCLASS
THE 2 PILLARS OF THE METHOD
CONSCIOUS BREATHING
Conscious breathing is at the heart of the o2co2 method. By learning to control your breath, you learn to calm stress, improve your energy and release tension, while boosting your immune system and mental clarity.
CONTROLLED COLD EXPOSURE
Controlled cold exposure completes the practice. We suggest and teach you different ways of exposure, to take full advantage of its benefits. The method adapts gradually to your abilities, emphasizing flexibility and listening to your body. Combined with breathing, it transforms your body and mind, restoring vitality, balance and performance.
DISCOVER YOUR TRAINERS
We are the co-creators of the O2CO2 method. With over 20 years’ cumulative experience and thousands of people trained worldwide, we help everyone improve their well-being and performance through breathing and exposure to cold.
MARC ROMAIN
Breathing & cold instructor (Wim Hof Method, Breatheology, Oxygen Advantage, Pranayama), holder of 3 world records for breathing/apnea in cold water.
MATTHIEU DUBREUCQ
CrossFit Level 4 coach, former Olympic athlete, specialist in performance programming.
We have designed this program to provide concrete, progressive and safe techniques, accessible to all, to transform your health and your everyday life in a lasting way.
OUR VISION
Beyond the method,
a vision to share
The o2co2 method grew out of ten years of experience, training and daily practice. What we discovered profoundly changed how we live, face challenges and care for ourselves.
This experience inspired us to share these tools with as many people as possible.
We have a dream: that each person’s well-being can help build a more conscious, supportive world that respects all living things.
We believe that by learning to understand ourselves and find our balance, we can become more available to others, more mindful of our environment and more attentive to what we pass on to future generations.
For us, breathing, cold exposure and meditation are paths of exploration and transformation. Our aspiration extends beyond their individual benefits: it reflects a desire to care for one another and for our planet.
That is why we chose to make our masterclass free and accessible on YouTube. So that financial circumstances do not prevent anyone from discovering these practices.
Together, let’s grow a community that breathes consciously. Everyone can contribute by practising, sharing experiences and passing these free resources on to others.
Marc and Matthieu
WHAT THE MASTERCLASS INCLUDES
9 hours of videos
Understand and practice the o2co2 method at your own pace.
12 guided breathing exercises
To calm stress, improve energy and release tension.
12 cold exposure protocols
Suitable for all levels, with gradual progression and attention to your body.
10 interactive animations
To visualize and master your breathing techniques.
Free guide · 82 pages
Read it online or download it to keep and share. No sign-up.
Access the free guide (PDF in French)
FREE MASTERCLASS ON YOUTUBE
Keep track of your progress and practice anywhere, as much as you like.
On YouTube · Free · In English
Your journey starts here
Explore our videos, explanations and demonstrations at your own pace.
Discover
The o2co2 method
Watch on YouTube
Understand
Cardiac coherence
Watch on YouTube
Explore
Getting started with cold exposure
Watch on YouTubeA small gesture makes a real difference
Found an episode helpful? Like the video, share your experience in the comments and subscribe to the channel. These free gestures help more people discover the masterclass and grow our community.
TESTIMONIALS
ARE YOU A COACH?
Develop your expertise in breathing and cold exposure
The o2co2 Masterclass is the ideal tool for enriching your teaching and offering your students innovative techniques that clearly set you apart from the competition.
Why it's for you
– Understanding the role of breath, CO₂, pH in performance and stress, and how they regulate physiology, the immune system and the body’s major balances.
– Master safe, progressive protocols for breathing and exposure to cold.
– Add powerful techniques applicable to all levels.
– Boost your students’ results: energy, recovery, focus, stress management.
Your advantage
A modern method that sets you apart, reinforces your expertise and raises the quality of your sessions.
👉 For more information: info.o2co2@gmail.comFor companies and organizations
Improve the well-being, performance and resilience of your teams.
Invite your colleagues to discover the method through our free masterclass on YouTube and practise every day with the two free exercises in the o2co2 app.
Why it's right for your business
• Reduce stress, mental load and anxiety.
• Improve concentration, creativity and clarity of mind.
• Support better recovery and management of workplace pressure.
• Boost energy, motivation and team cohesion.
• Accessible to everyone, including beginners.
• A commitment to well-being that offers a real return on investment: less absenteeism, greater efficiency and better collective performance.
Together, let’s take this mission further
We chose to share the masterclass for free to make these practices available to as many people as possible.
To keep creating and sharing new free content, we need support. If your company would like to contribute to this mission, every financial contribution, large or small, means a great deal to us.
This support is entirely voluntary: access to the masterclass remains free.
E-mail: info.o2co2@gmail.com
Address: Montreal, QC, Canada
Join us on Instagram, Facebook and YouTube!
We share our knowledge and experience of the four keys to the o2co2 method, as well as tips for improving your health, well-being and performance. You’ll also find training videos, expert interviews, customer testimonials and exclusive special offers and promotions.
Do you have any questions? Write to us!
Do any of these situations sound familiar?
Persistent fatigue, low energy levels
Difficulty regaining vitality despite rest.
Stress, anxiety
Constant inner tension, shallow breathing and a restless mind.
Irritability
Everything irritates you easily, and you lose patience without understanding why.
Anxiety attacks
Feelings of tightness, breathlessness or loss of control.
Performance at work
Difficulty staying focused, clear and effective over time.
Sports performance
Getting out of breath quickly, recovering slowly or struggling to find your rhythm during exercise.
Sleep disorders
Difficulty falling asleep, waking up at night or unrefreshing sleep.
Chronic pain
Muscle tension, backache or persistent diffuse pain.
Inflammation problems
Recurring physical discomfort, sensitive digestion or painful joints.
Decreased concentration
Scattered mind, difficulty staying present and focused.
Reduced motivation
Lack of momentum, loss of meaning or pleasure in your activities.
Feeling emotionally blocked
Suppressed emotions, difficulty expressing or releasing your feelings.
Weakened immune system
Frequent fatigue, repeated infections, loss of resistance.
Difficulty in recovering from exertion or illness
Slow to regain your usual energy level.
Lack of creativity
An overloaded mind, difficulty imagining, innovating or creating.
Lack of self-confidence
Recurring doubts, fear of taking action, feeling "out of breath".
APP o2co2
DOWNLOAD YOUR FREE APP
Turn discovery into daily practice: the o2co2 app gives you access to two essential breathing exercises for free, cardiac coherence and guided breathing.
To take your practice further, a Premium option offers additional exercises and features.