When Systems Meet Scale


Hi everyone,

Over the past month, many of you experienced turbulence across Athletica.

We know that when your training doesn’t work smoothly, explanations don’t matter. Outcomes do.
Still, I want to briefly explain what happened, why it mattered, and where we are now.

At its core, Athletica is not a chatbot or a dashboard. It’s a sports science system.

The figure below shows the Athletica architecture. Raw data from your wearables doesn’t go straight to a screen or an AI response. It’s first parsed, organised, and accumulated into a longitudinal athlete record. At the centre sits the LAB, where physiological models compute training load, profiling, readiness, and adaptation over time. The AI layer sits on top of this system, interpreting those outputs so you can act on them.

This is also why the launch was stressful for the platform. When a system reasons over history rather than displaying data, scale exposes everything at once.

The good news is this: the system is now stronger than it was before launch.

Athletica can better support beginners without diluting what advanced athletes need. The Athletica Coach can now help across training history, recovery, pacing, long-term development, and learning through Athletica U. The science held. The engineering learned.

If you’d like a deeper explanation of how the system works, why we chose this path, and what Sports Science 3.0 looks like in practice, I’ve written a longer piece here.

Finally, to bring this full circle: Workout Wizard.

Workout Wizard is the interface that returns the full depth of this intelligence back to you in a practical, moment‑to‑moment way. It’s currently being extensively tested by our beta group, and their feedback is shaping how we help athletes adapt sessions confidently, safely, and intelligently in the real world. This is the last major piece of the puzzle to implement into the New Athletica Experience, and we’re expecting it to be available for everyone as early as next week – better than ever.

Thank you to everyone who stuck with us, reported issues, and helped improve the system.

More soon,
Paul

Paul Laursen, PhD


Athletica AI Coach and Training Science

Smarter training starts here. Athletica’s newsletters deliver science-backed insights, expert tips, and AI-powered training updates for endurance athletes of all levels. Catch up on past editions and subscribe to stay ahead in your training journey.

Read more from Athletica AI Coach and Training Science

Dear Reader, I remember learning about energy systems in school. Professor Paul Gastin's diagram was the gold standard: a clean picture of how much each system contributed depending on effort duration. You've probably seen similar. ATP-PCr, Glycolysis/lactic, Aerobic; each with its lane, each with its moment. Gastin (2001)'s classic energy system interaction model for maximal exercise. Then I watched a film that added the piece Gastin hadn't for me. That these systems are never one or the...

Hello Reader, Sebastian Sawe ran 1:59:30 in London last weekend. Three men finished under the previous world record for the marathon. Coaches and media publicly credited 100–120 g/hr of carbohydrate. The running internet promptly lost its mind. So on the Athlete’s Compass Podcast this week, Paul Warloski and I took the question head-on: should you be eating like Sawe? Short answer: no. But the longer answer is more interesting. And it points somewhere the sports nutrition field hasn’t quite...

Welcome to Inside Athletica April edition. The Workout Wizard is now live for everyone - including inside the mobile app. Smarter swaps, better context, and more flexibility when life doesn’t go to plan. We’re also actively working on upgrading the AI Coach. The feedback you’ve been sending has been incredibly valuable - keep it coming. With summer around the corner, many of you are heading into marathon blocks. This is where consistency, smart adjustments, and staying healthy really start to...