Origin
Why This Program Exists
Three established breathing traditions are based on the same mechanisms. Our program makes it accessible for everyone.
The Person Behind It
Why This Exists
Eighteen years of teaching Buteyko breathing left me with a question. Early on I taught the strongest version of the method. It provided the best results, but many people found it too intense to sustain long-term. I adapted the approach to give people more control over their own intensity and encouraged lower intensity for better long-term results. But the question stayed open: if the strongest version works best, is there a way to make it easier to do and easier to teach?
Over the last ten years, I took an increasingly experimental attitude to the practice. I was particularly interested in ways that allow effective training while measuring how the training impacts body and mind. Achieving this required changes to the exercises that went beyond the Buteyko framework and were inspired by pranayama and Tummo.
That also required a new app: new exercise flows, a wider selection of variants, a walking version, and sensor-free stress detection that finds the right intensity for you. Zones show your position in real time and tell you whether a breath-hold was right or too strong. Relaxation is at the center of the design, because the deeper you relax, the better you perform.
A Hard Problem to Solve
Three established breathing traditions independently discovered that breathing less delivers more oxygen to the cells. Each developed effective training for it. And each ran into the same wall when it tried to reach many people: the strongest training is the part that needs a skilled teacher, one student at a time. So every tradition that spread widely did it by leaning less on that part, each in a different way.
In yoga, pranayama with extended breath retention is the most advanced practice, the culmination of years of dedicated training. The practitioners who reach that level are true masters. The problem is that this path requires a long-term teacher-student relationship and years of preparation. Very few yoga teachers reach or teach the deeper pranayama. What the masters achieve is the deepest level of the practice, but the way to get there cannot reach many people.
Buteyko researchers proved the mechanism: CO₂ tolerance drives oxygen delivery. Research confirmed strong results. But the full original version of the method required skill and judgment that Buteyko found very hard to transfer to new instructors. It took too long. He said himself that after a full year of training, only about 2% had the ability. So he made a simpler, weaker version of the method. That version spread worldwide. The original results stayed locked behind rare expertise.
Modern tummo (the 30-breath method) showed that millions of people will hold their breath if given a simple framework. That was a breakthrough, and it entered popular consciousness in a way no breathing method had before. But many people find it doesn't fit. The deep hyperventilation, the breath hold style, and the cold exposure come as a fixed package with no room to adapt. It reached a mass audience, but it doesn't meet people where they are.
The same pattern repeats across all three: the strongest training stayed rare because it needed a teacher, and what reached many people was the lighter version. Closing that gap, keeping the strong training and still reaching everyone, is what this program set out to do.
Research
Stanescu et al. 1981, J Appl Physiol
60% more efficient CO₂ response
Breathing training recalibrates the CO₂ response
The Reuvers program is designed to improve your CO₂ response over months and years.
More research →Three Traditions
All three breathing traditions train the same underlying physiology: the ability to maintain calm, efficient breathing while CO₂ rises. In physiology, this is called CO₂ tolerance. When CO₂ tolerance is high, oxygen flows freely from the blood to the cells. More oxygen from less air.
Pranayama trains it through graduated breath retention (kumbhaka). Buteyko trains it through reduced breathing and extended pauses. Tummo trains it through breath holds after intense breathing. Different entry points. Same destination.
The research confirms that this mechanism is not tradition-specific. It is human physiology.
60 Years of Evidence
The evidence spans six decades, multiple countries, and thousands of participants. The findings are consistent: when breathing training specifically targets CO₂ tolerance and oxygen efficiency, results are strong across sleep, stress, focus, and physical performance.
Research
Li et al. 2023, Frontiers in Medicine
Protects cells, verified in 10 trials
Breathing exercises lower cell-membrane damage markers and raise antioxidant defenses. Verified across 10 trials and 519 participants.
Regular practice with the Reuvers program builds lasting cellular protection over time.
More research →Research
Salimi, Vahid-Ansari & Bhatt, 2023, Frontiers in Human Neuroscience
Nasal breathing activates the brain's focus networks
Nasal airflow mechanically drives the brain's default-mode and integration networks. The effect is absent during mouth breathing.
Nasal breathing is the default throughout the Reuvers program.
More research →Research
Leyro, Versella & Zvolensky, 2021
Reduces anxiety, proven across 40 trials
Breathing practice consistently reduces anxiety across 40 randomized trials with over 3,000 participants. Biofeedback-guided practice approached an effect size of 1.0.
The Reuvers program includes breathing exercises specifically designed to reduce stress and anxiety.
More research →Research
Courtney, 2020, Sleep and Breathing
Breathing practice improves sleep quality
Breathing retraining reduces snoring, daytime sleepiness, and nighttime arousals.
The Reuvers program's nasal breathing and volume-reduction exercises directly address the breathing patterns behind poor sleep.
More research →Research
Dallam et al. 2018, Int J Kinesiology & Sports Sci
Same VO₂max, better breathing economy
Nasal breathing improves running economy
The Reuvers program trains nasal breathing from the first session.
More research →Research
Bentley, D'Angelo & Powell, 2020
Anxiety down in five-minute sessions
A six-week program of five-minute breathing sessions reduced trait anxiety. Every participant completed the program.
The Reuvers program is self-guided, with built-in feedback that makes effective calibration accessible without an expert.
More research →Research
Glubokaya et al. 2021, Bulletin of Tula State University
1 km run 7-8 seconds faster after 5 months
Breath-hold training improves running performance
Breath-hold training in the Reuvers program's higher levels builds the same adaptation.
More research →Why This Stayed Rare
The mechanism is understood and the results hold up. So why hasn't this become standard practice?
Because the strongest version requires real-time calibration. Push too hard and the nervous system activates, undermining the CO₂ tolerance you are trying to build. Push too little and nothing changes. The right intensity is different for every person and shifts session to session.
Customizing the instruction to each student requires judgment that takes years to develop. Professor Buteyko said that after a full year of instructor training, only 2% of new instructors could deliver the method at the quality level needed for best results.
The limitation is an exercise customization problem. People need options to adjust the exercise to what works for them. And the exercise itself needs to detect when something isn't working and signal that a change is needed. Both of these are solvable with the right technology.
Get the Foundation Right
Every session trains three things: your breathing muscles, your oxygen efficiency, and your ability to focus and relax.
When you get the foundation right, everything else follows.
The App That Measures What Instructors Used to Guess
The Reuvers method came from open experiment, and its core is real-time stress and performance measurement built into the exercise. The app reads your breathing response after each breath hold. What matters is how your nervous system reacted afterward, more than how long you held.
A long hold followed by gasping scores red. A moderate hold followed by smooth recovery scores green. You know immediately whether you pushed too hard or not hard enough. Practice intensity is measured in every round.
The training adapts to you automatically through built-in feedback loops. The app reads your response, adjusts intensity, and tracks progress over time. This feedback loop works without needing a physical sensor. Just a new and smarter approach to analyzing your breathing sessions.
Instructors supplement the app with broader guidance: managing side effects, the bird's eye view of your training, walking exercises, and higher-level techniques. The app handles moment-to-moment calibration. The instructor handles the bigger picture.
For the full evidence base, see the research page.
View the research →