Compact
FIT is built for efficient activity transport, which is one reason it remains common in device-centered training workflows.
FIT is built for efficient activity transport, which is one reason it remains common in device-centered training workflows.
The format can carry route points alongside workout-oriented metrics such as heart rate, power, cadence, and timing.
Garmin is the main reference, but FIT also appears across Wahoo, Zwift-related workflows, and downstream activity sync pipelines.
A FIT file stores structured activity data in a compact binary format. It is commonly used when a workout needs timestamps, route points, and sensor metrics in a format many training devices and platforms can process efficiently.
FIT is often preferred when you want an efficient file size and broad device support. GPX is useful for route geometry, while TCX is XML-based and readable; FIT is designed around compact transport of activity and sensor data.
Garmin devices and Garmin Connect are the most common examples, but FIT files are also common in Wahoo ecosystems, indoor training workflows connected to Zwift, and broader activity pipelines that later sync with Strava.
Yes. FIT is well suited to structured metrics such as heart rate, wattage, cadence, elapsed time, and location data, which makes it useful for detailed training records.