Built by an Engineer, Tested by an Athlete
Hybrid Athlete
Where Strength Meets Endurance
32 Garmin Fitness Age
3:23 Marathon PB
>2500km Ran Last Year
Engineering Performance Thomas Prommer — Hybrid Athlete
Technology executive by day, endurance athlete by passion. Combining the discipline of marathon running, the mental toughness of Ironman triathlon, and the hybrid demands of HYROX competition.
Training Disciplines
Deep dives into each sport
Marathon
42.195km of pure endurance. Race history and training.
Explore →Triathlon
Swim, bike, run. From sprint to Ironman distance.
Explore →HYROX
The fitness racing world championship format.
Explore →Swimrun
Open-water swimming meets trail running. Teams of two.
Explore →Follow My Training
Recent Results
Personal bests and race highlights
Dec 2025
Valencia Marathon
Marathon • Finisher 3:51:01 Finish Time
Sep 2025
Berlin Marathon
Marathon • FinisherPerfect autumn conditions. Executed negative split strategy in the final 10K.
3:55:07 Finish Time
Jun 2025
Fürth Metropolmarathon
Marathon • Finisher 3:23:41 Finish Time
Upcoming Races
Race calendar and training focus
Free Training Tools
Train Smarter with Data
The same algorithms I use for my own marathon and Ironman prep, now available as free calculators.
Solid performance on a fast course. Recovery from Berlin training block showing.