Romain Guery-OdelinPersonal · Personal app · Since Aug. 2026
Élan, my health and fitness coach
Off-the-shelf apps pile up data without showing a trend. I built my own: nutrition, workouts and sleep in one place, a daily mission, a trajectory, a weekly review with one area to improve.
Context
Personal project, since August 2026. I am my own user: the best ground to test what I later recommend to others.
The problem
Nutrition, exercise and sleep lived in three different apps, each with its own numbers and no overall picture. Plenty of data, no trajectory, no decision made easier.
What I did
- Designed the product from actual use: a daily mission, a trajectory towards the goal, a weekly review with a single area to improve, challenges and XP to keep going over time.
- Five screens: day, trajectory, review, physical, journal.
- Automatic sync every 2 hours from Garmin (workouts, sleep) and Yazio (nutrition): the app does the work, I type nothing in.
- Built with the AI tools I test in my ongoing watch, while keeping control of the architecture and code quality.
- Put into production and used daily, with an iteration for every friction point met.
The result
An app in production, used every day since August. Next step: goal-based coaching. Beyond personal use, Élan is my proof that a well-understood need, a design centred on decisions and automation that runs by itself make a clean tool — without being a developer by trade.
An app used every day since August, syncing every 2 hours with Garmin and Yazio, no intervention needed.