By optimizing your metabolic health we help you unlock your full athletic potential — whether that's conquering Ironmans, marathons, Hyrox, or simply feeling stronger, more powerful and full of energy every day.
your metabolism is your hidden powerstation. Cranck it up or stay stuck.
We are experiencing a permanent shift in running- training- health and fitness perspectives. On this page we share precisely what this shift is about, why this shift is happening today and emphasize the urgency of embracing this new approach. Our insights are drawn from consultations we had in the past 8 years with over 900 runners from all over the world, ranging from athletic marathon runners to health-conscious fitness enthusiasts.
Smarter, more efficient and effective
Marlies Kort and Coach Baz - Founders
Game-changing PRs
Most runners chase faster times by piling on miles, chasing workouts, and hoping fatigue and injury don't show up. We have been deluded with deep rooted training mistakes, fitness approaches and nutritional choices traditional trainers, coaches and dieticians told us the past 40 years.
Even while diligently following common Western life guidelines for fitness, nutrition, and health, you may find yourself facing a gradual loss of muscle and overall strength, alongside feelings of low energy and unexpected weight gain.
The truth is: your energy systems, metabolic markers and hormones control every result you get. If your metabolism isn’t optimized, even perfect form, perfect tempo, and perfect shoes won’t produce game-changing PRs.
breaking the metabolic barrier
Metabolism - the engine your legs rely on
this is how we work
Our goal is not to 'fix' what's not working. Our goal is to replace what's not working with something completely new. With CENTATHON we emphasize on the significance of addressing the FOUNDATIONAL elements that contribute to maximizing your performance. This isn’t a generic training program. Traditionally, performance improvement centered around adopting exhaustive programs based on running endless training miles, gym sessions and all sorts of diets. With CENTATHON we offer a system designed to push your performance without destroying your energy, your family and social life, your back or your joints. This is how we work:
✅ Training Plans and Schedules that respect your time, your other obligations, your energy budget and optimize training output.
✅ Metabolic Health Assessment: a precise look at your vital metabolic markers, autophagy, GKI index, VO2max, heartrates, blood glucose, ketosis, sleep, digestion
✅ Personal Metabolic Protocol: a science-backed plan tailored to your biology—training load, nutrition optimization, fuelling strategies, and recovery optimization.
✅ Accountability & Iteration: weekly check-ins, data-driven tweaks, and an evolving plans you can actually stick to.
The required time investment is 4-6 hours per week, to reach any goal we define at program start
..and this is what you get
What's Next
We're are excited to offer a first free consultation:
We’ve helped hundreds of people move from plateauing to consistent improvement—energy up, recovery faster, weight in check, and pace ticking down week after week. This isn’t guesswork; it’s a defined metabolic blueprint built on science, real-world metabolic performance indicators and results.
In our free consults you’ll receive:
🎯 a personalized metabolic quick-win plan you can start this week,
🎯 clarity on what’s holding your (running-) performance back,
and
🎯a concrete path to regaining your performance, motivation and stamina
No pressure, no fluff—just a clear decision map for your running/health/fitness future.
A concrete path to regaining your performance, motivation and stamina
transformative experience
Working with us in person and engaging in the CENTATHON Longevity Running & Fitness Program goes beyond simply enhancing physical skills. It represents a comprehensive transformation of both your overall fitness and metabolic health—an integrated revision of your athletic and metabolic performance.
Say goodbye to the gradual burnout associated with traditional exhaustive training methods and leave behind restrictive calorie deficit diets. These outdated approaches are no longer part of the strategy for improvement.
The CENTATHON Longevity Running and Fitness Program is not just another training system; it is a transformative experience tailored to elevate every aspect of your life.
We will fundamentally change your perspective on lifelong running, health and fitness, setting you on a path to sustainable fitness, health and well-being.
A transformative experience tailored to elevate every aspect of your life
Click the link, choose a time, and tell us a little about your goals and current routines. Let’s fix your metabolism first, and watch your speed, recovery, and weight stabilize—so you can run longer, faster, and smarter. This call is commitment-free and tailored to your biology.
If we don’t think we’re a good fit, we’ll tell you straight away. If you’re not satisfied after the first session, we’ll adjust or part ways with no hard feelings. Your time and results come first.
Common questions: 1) Do I need to be an established runner? 2) Do I need to change my diet? 3) How much time is required? 4) Is this for all levels?
Answered in the call.
monitoring biomarkers
The CENTATHON Longevity Running and Fitness program has successfully transformed the behaviour and practices of our students across various ages, weight classes and fitness levels, ensuring highly effective steps into an enjoyable health and fitness based longevity journey.
You will not only get the knowledge how to transform yourself. You will also get a deep understanding of how to control both your athletic AND metabolic performance and wellbeing- which you can share with the people around you, your family, your spouse, friends, the people you love and concerned with.
You will teach you to monitor and document essential (bio-)markers in personal data-files we will provide, together with our personal advise, help, our operating routines, procedures and structures.
We work with all students in person
CENTATHON is a full service program. Marlies Kort and Coach Baz work with all students in person, through online sessions you can schedule yourself, on any date and time convenient for you, via Zoom. We actually provide you with a complete set of devices and tools to monitor all bio-markers as described above. And you will get access to our knowledge bases we developed over the past 2 decennia, the CENTATHON Resources Platforms you will get exclusive and unlimited access to. We will guide you through the resources and we'll teach you the structures and routines to record and document your numbers progress over time, for life.
Bastian Zwaan MSc (Coach Baz) received his degree from the Technical University of Delft, The Netherlands, on Ergonomics and Human Factors, the science of human interaction and design. Bastian (66) is certified neuro-assotiative top-coach and co-founder of CENTATHON, CENTATHON Longevity Running and Fitness, the CENTATHON Longevity Index and The 9Mile Marathon Training System, together with Marlies Kort.
Marlies Kort, busy mom of 2, creator and founder of The 9Mile Marathon training system, and co-founder of CENTATHON, CENTATHON Longevity Running and Fitness, the CENTATHON Index together with Coach Baz.
Marlies (53) studied architecture and interior design, and she is a certified running and fitness coach for 30 years. In 2015 she became World Champion Ironman 70.3 in the Female 40-44 category and she won numerous Ironman 70.3 races such as Aruba, Miami, Tennessee, Panama, Boulder, Cartagena, Austria, Puerto Rico. Top10 marathon finishes in a.o. Boston, New York, Miami, Rome, Berlin, Curacao and Rotterdam. Her running pb's are impressive - Marathon pb Berlin 2h47, Half Marathon pb 1h16, 10k pb 35:12 and 5k pb 17:02
Our aim is to help you develop new routines and reach a new level of metabolic and athletic performance. Many of our students who work with us for a year have secured their new routines and habits for life. Currently we have students who are working with us for 3 years and more, reaching new levels of controlling and securing their metabolic health and their athletic performance on events like half- and full marathons, Ironmans, Hyrox, ultra's and Crossfit style events such as bootcamps, ultra obstacle races and multi-day multi disciplinary outdoor events. Even in their 50's, 60's and 70's.
First Results In 2-3 Weeks
The CENTATHON system allows to measure and quantify the progress you are making in terms of evidence based data. This applies to both athletic- and metabolic performance.
Our students show first results in just 2 or 3 weeks. Improving their running, their strength and improving measurable metabolic indicators such as your ability to burn fat as your main fuel and your ability to be in a state of autophagy- immediately resulting in better sleep quality, a clearer mind, energy and recovery. We have seen dramatic (metabolic and athletic-) results after just one month. We've seen most LASTING transformational change after 2-3 months.
Is it worth the cost?
With the CENTATHON Longevity Running and Fitness program we tackle the fundamental question that you face during your lifetime: "What can I do NOW to improve my running, overall fitness, health, quality of life and my longevity?" For students dedicated to collaborating with us in person and willing to put in the work, this program has the potential to significantly alter the course of both your healthspan and lifespan.
We are unable to determine whether the advantages of this program justify the cost, especially when considering the long-term benefits over your lifetime. And, in particular, if you amortize the cost over your life as you should amortize the program benefits over your life.
Nevertheless, we can confidently state that we developed this program with the explicit intention that the long-term benefits unquestionably outweigh the cost!
What's Next
We're are excited to offer a first free consultation:
Above and beyond AI generated content and what's available for free
CENTATHON weekly student group calls
It is of utmost importance to us to provide all of this without relying on paid advertising. To ensure this, our operations are entirely sustained by our membership fees.
In exchange, through the CENTATHON Program, we provide a personalized service with carefully produced and curated content, video tutorials, vision, strategies, lectures and new paradigm shift insights with a 100% unbiased, open view, free from influence, guidance, or control of others. Please note that this service does not provide medical, professional, or licensed advice and is not a substitute for consultation with a health care professional. You should seek medical advice from a qualified health care professional for any questions. When you are in doubt please always consult your doctor or a health care professional first. The information on CENTATHON is for informational purposes only and may not be appropriate or applicable for your individual circumstances.
This site is not a part of YouTube, Google, Instagram or Facebook; Alphabet Inc or Meta Platforms Inc. This site is NOT endorsed by YouTube, Google, Instagram or Facebook in any way. Facebook and Instagram are trademark of Meta Platforms, Inc. Youtube and Google are trademarks of Alphabet Inc.