Understanding FIT Files: The Backbone of Modern Fitness Tracking
Why devices like Garmin and Wahoo rely on FIT for high-resolution workout data
12/18/2025
Articles
Product updates, roadmap notes, and tips for converting TCX to FIT.
TCX Files: Structured Workouts with Broad Compatibility
A human-readable alternative to FIT used across Garmin, Polar, and Strava
12/17/2025
ZWO Files: How Zwift Knows What Workout You’re Doing
The format behind interval training, power targets, and indoor plans
12/9/2025
GPX Files: The Universal Language of GPS Routes
How GPX became the go-to format for sharing maps, tracks, and outdoor activities
12/4/2025
KML Files and Fitness Data: Built for Maps, Not Metrics
How KML turns workouts into visual experiences in Google Earth and Maps
12/1/2025