Published June 29, 2026
The History of the VDOT Running System: From Jack Daniels to the V.O2 App
Explore the origins of the VDOT training system developed by Dr. Jack Daniels and how it evolved into the modern V.O2 app for runners.
Introduction
The VDOT running system is a scientifically validated method for predicting race performance and prescribing training paces. Developed by the legendary coach Dr. Jack Daniels in the 1970s, it has become a cornerstone for runners of all levels. The V.O2 app brings this system to your smartphone, making personalized coaching accessible.
The Birth of VDOT
Dr. Jack Daniels, a two-time Olympic medalist in modern pentathlon and a renowned exercise physiologist, created the VDOT system after years of research. VDOT stands for 'V̇O₂max' (maximal oxygen uptake), but the system simplifies this into a single number that represents your current running fitness. Daniels' book, 'Daniels' Running Formula,' first published in 1998, introduced the concept to a wide audience.
How VDOT Works
The system uses your recent race times to calculate a VDOT score. This score then determines training intensities for easy runs, tempo runs, intervals, and repetitions. It takes the guesswork out of pacing and helps runners train at the right effort levels.
From Book to App
For decades, runners manually calculated their VDOT scores using tables. The V.O2 app, developed by The Run Smart Project, LLC, digitized this process. It syncs with GPS devices like Garmin and Coros, automatically updates your VDOT based on new races, and adjusts your training plan accordingly.
Why It Matters Today
The V.O2 app continues Dr. Daniels' legacy by making elite-level coaching available to everyone. It respects the scientific foundation while adding modern convenience. As of 2026, the app remains a top choice for runners seeking data-driven improvement.