Mathias Bak Bertelsen
Co-founder and software engineer at Atlon
Mathias is one of the founders of Atlon. He worked as a software engineer at Uber before co-founding Atlon.
Atlon started with his own training. During the 2018 CrossFit Open he did each workout twice, on Friday and again on Sunday, and analysed his first attempt by hand to plan the second. He wanted a watch that could do that analysis for him, so he built a prototype that recognised exercises and reps from smartwatch sensor data. It launched on the App Store as Wodscribe in December 2020 and is now Atlon.
He reviews everything published in the Atlon Journal and the FAQ. He isn’t a coach: training advice here comes from Atlon’s data on real workouts and from published research, and each post links its sources.
On the Atlon Journal
- AMRAP strategy: how to pace it, round by round
- Apple Watch calories for HIIT: how accurate are they?
- Can Apple Watch track weightlifting? How to log every set
- How long athletes really rest between sets in a WOD
- The most-trained exercises in functional fitness (2026)
- What is an EMOM? How to pace it and time it on your watch
- Tracking WODs and HIIT on Apple Watch: the complete guide
- Workout formats explained: EMOM, AMRAP, RFT and Tabata
- Track Your Fitness Goals: The Top 5 Workout Tracking Apps
- How to split your sets in a WOD
Earlier, on Medium
- 7 tips for a better Wodscribe result
- The next generation fitness tracker
- Wodscribe is now available on the App Store
- Using software to analyse and improve my workout performance, part 2
- Using software to analyse and improve my workout performance