TrainingPeaks Launches Fueling Insights, in Collaboration with Dr. Iñigo San Millán
Louisville, Colo. (July 16, 2025) — TrainingPeaks, the leading endurance training platform, today announced the release of Fueling Insights, a new feature that gives coaches and athletes unparalleled visibility into fat and carbohydrate utilization during power-based cycling workouts.
As high-carbohydrate fueling strategies have come to the forefront of performance sports nutrition, this new feature allows coaches to offer more personalized, effective fueling plans, based on world-tour proven metabolic research.
Developed in collaboration with renowned physiologist and former Director of Performance for Team UAE Emirates Dr. Iñigo San Millán, Fueling Insights takes the data from any power-based cycling workout and indexes it using one of four metabolic profiles developed over decades of respiratory exchange rate (RER) lab testing performed by Dr. San Millan.
The algorithm is fueled by more than 250 highly-calibrated tests across every ability of rider, and takes gender, metabolic profile, and ride dynamics into account. The result is one of the most accurate fat and carbohydrate burn estimates you can get outside the lab.
“This methodology is something I started using 20 years ago,” said San Millán. “It is what led me to observe that elite cyclists needed significantly more carbohydrates than the guidelines recommended at the time, increasing from 35–55 grams per hour up to 80–100 grams per hour. Ultimately, this led us to push even further, up to 125 grams per hour, as I did with Tadej Pogačar in his first professional year.”
“With Fueling Insights, coaches and athletes can experiment with high-carbohydrate fueling in a more informed way — which means more good workouts and less GI distress,” said Dirk Friel, co-founder of TrainingPeaks. “This bridges the gap between science and everyday training, helping athletes fuel more effectively so they can unlock their full potential.”
Fueling Insights is available now in the TrainingPeaks web app for coaches and Premium athletes. It is currently only available for power-based cycling workouts, with more sports in the works.
Learn more about Fueling Insights and the methodology behind it, here.
About TrainingPeaks
TrainingPeaks creates endurance training apps and solutions that help athletes and coaches reach their goals. Featuring the world’s largest endurance training marketplace, athletes can find personalized training plans, accredited coaches and easy-to-use apps and integrations to track their progress and reach their goals. TrainingPeaks is trusted by runners, cyclists, and triathletes around the world, including Tour de France teams, IRONMAN® World Champions and Olympians. Learn more at trainingpeaks.com.