Using ChatGPT to Train for the Paris Marathon

Bloomberg Markets and Finance
Bloomberg Markets and FinanceApr 12, 2026

Why It Matters

AI‑driven coaching could democratize elite‑level marathon preparation, reducing cost and increasing accessibility, while still requiring human oversight to ensure safety and accuracy.

Key Takeaways

  • ChatGPT created a personalized, adaptive marathon training plan.
  • AI responded to daily feedback, adjusting workouts in real time.
  • Human coaches lack the instant customization AI can provide.
  • ChatGPT hallucinations emerged when data input exceeded its limits.
  • Hybrid approach—human plus AI—offers most reliable marathon preparation.

Summary

The video follows a former marathon runner who, after a disastrous Marine Corps Marathon ten years ago, decides to tackle the Paris Marathon using ChatGPT as a virtual coach. Living in San Francisco, the AI hub, he is motivated by the city’s optimism about artificial intelligence and curiosity about its capabilities.

He fed the model details of his past 5K, 10K runs, soccer, and tennis activities. ChatGPT generated a five‑to‑six‑day‑a‑week schedule that was more structured, responsive, and personalized than typical apps. When he reported fatigue or injury, the AI adjusted mileage and intensity on the fly.

He notes a podiatrist’s warning after his first marathon and later hears from developers of emerging AI‑fitness platforms that such dynamic coaching is a future goal. However, the system began “hallucinating” after too much input, illustrating current limits.

The experiment suggests AI can lower barriers to high‑quality training, offering cheaper, adaptable plans, but it also underscores the need for human expertise to catch errors and provide nuanced guidance. A hybrid model may become the new standard for endurance athletes.

Original Description

Bloomberg News Senior Editor for US Economics & Government Derek Wallbank used ChatGPT to train for the Paris Marathon. He sits down with Christina Ruffini and Tim Stenovec on Bloomberg This Weekend before his big race to discuss. Watch the show LIVE every Saturday and Sunday morning.
--------
More on Bloomberg Television and Markets
Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9
Visit http://www.bloomberg.com for business news & analysis, up-to-the-minute market data, features, profiles and more.
Connect with Bloomberg Television on:
Connect with Bloomberg Business on:
More from Bloomberg:
Bloomberg Surveillance: https://twitter.com/bsurveillance
Bloomberg Politics: https://twitter.com/bpolitics
Bloomberg Originals: https://twitter.com/bbgoriginals
Watch more on YouTube:
Bloomberg Originals: https://www.youtube.com/@business

Comments

Want to join the conversation?

Loading comments...