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Endurance Training Expert
Train slower.Race faster.Every season.
Stephen Seiler’s evidence-based training guidance, the polarized 80/20 model applied to your body, your data, and your week through Ottavia.
Stephen Seiler
Exercise physiologist. Researcher. Educator.
Most training time belongs at genuinely easy intensity, a small share genuinely hard, and surprisingly little in the moderate middle. The pattern he documented in world-class endurance athletes is the pattern Ottavia applies to your week.
Stephen Seiler is a Professor of Sport Science at the University of Agder in Norway, and the pioneer of the polarized training model, built from years of studying world-class endurance athletes.
His research on training intensity distribution, endurance adaptation and recovery balance is widely cited across endurance sport, through papers and talks such as The Hierarchy of Endurance Training Needs.
Professor of Sport ScienceUniversity of Agder, Norway
Pioneer of the polarized 80/20 modelIntensity distribution studied in world-class endurance athletes
Endurance adaptation and recovery balanceEasy aerobic work, threshold, HRV, recovery
Widely cited across endurance sportCited 16K+ times
Start with Stephen Seiler today.
From Stephen Seiler
- Explore training questions through Seiler’s knowledge
- Your workouts, with added context
- Ideas for adjusting effort and recovery, grounded in Seiler’s work
Everything in Ottavia Plus
- Personal plans that adapt to your progress
- Insights across sleep, fitness, nutrition and recovery
- Timely guidance based on your activity
- Connect your wearables for deeper insights
$10 / month
Your local price is shown in the app before you buy.
Educational, not medical advice. Subscription happens in the Ottavia app.
Expert knowledge, applied to your day.
Your wearable data, habits, and goals come together with expert knowledge to deliver personalized guidance.
How Ottavia and Stephen Seiler work for you
Understand your body.
Ottavia recognizes patterns across your sleep, recovery, activity, nutrition, and lifestyle.
Know what to do next.
Every recommendation combines your health data with the expertise you trust.
Everything included with your subscription
The full Ottavia app, with Stephen Seiler's knowledge applied to every report, question and log.
Reports that explain, not just summarize.
Sleep, recovery, workouts, weight, blood pressure, and more. Each report connects your health data, habits, and personal context to uncover what matters most. Instead of overwhelming you with numbers, Ottavia highlights the patterns, explains why they matter, and helps you make better decisions.
Daily Reports
Start every day with clarity.
Ask Anything
Expert guidance for every decision.
Food Guidance
Know what to eat and why.
Adaptive Plans
Plans that evolve with you.
Smart Nudges
Helpful guidance at the right moment.
Your health tools, connected.
Connect your wearables, devices and apps to discover health patterns
COMING VERY SOON
COMING SOON
COMING SOONThe future of personalized health
Health isn't built in a day. It's built through years of small decisions, changing bodies, and evolving needs.
Built to grow with you.
Every day adds another piece to your health story. Over time, Ottavia connects your wearables, biomarkers, blood tests, symptoms, habits, and life events to uncover patterns unique to you.
Built by women for women
Women's health isn't a niche. From menstrual health and pregnancy to perimenopause and healthy aging, Ottavia is built to understand the biological changes that shape women's lives.
Your personal board of experts
No single expert has every answer. Build a trusted team of experts that grows with you, bringing together different perspectives for every stage of your life.
How does it work?
Connect your wearable or log your workouts, sleep and meals. Each morning Ottavia reads your recovery and your recent sessions, applies Stephen Seiler’s polarized method where it fits, and gives you one clear plan. Ask anything during the day; the answers use your own data.
What do I get with Stephen Seiler’s subscription?
His polarized 80/20 model and his published research on intensity distribution, applied by Ottavia to your own training, recovery and meals every day. You see where his work shaped a message, every time.
Why can’t I get this from ChatGPT?
ChatGPT is a general assistant: it knows what you tell it. Ottavia reads your wearable data every day and applies a named expert’s published method, with attribution. It is not advice about training in general; it is about your Tuesday run.
Is this medical advice?
No. Stephen Seiler guides and educates through Ottavia. He never diagnoses or prescribes.
Do I talk to Stephen Seiler directly?
No. Ottavia has read his published work and applies it inside your guidance. Your questions go to Ottavia; his thinking comes back in the answer, attributed.
What happens to my health data?
Your data stays in your Ottavia account and is used only to guide you. The third-party AI services Ottavia uses never learn who you are: they see the health context needed to answer you, never your name or contact details. Your data is never sold, never used to train AI models, and is deleted from those services when you delete your account.
Does Stephen Seiler see my data?
No. Experts contribute their methods to Ottavia; they never see individual users or their data.
Do I need a wearable?
Ottavia works best with Apple Watch or Garmin. Google Health, Oura and Whoop are coming soon. You can also log sleep, meals and workouts yourself.
What does it cost, and can I cancel?
The price is shown clearly before you subscribe. Manage or cancel anytime in the Experts hub; you keep access until the end of the period you paid for.