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FIT — Garmin FIT Activity
FIT is the binary activity file of Garmin, Wahoo and other sports watches and bike computers: the recorded track with time and sensor data.
FIT (Flexible and Interoperable Data Transfer) is a compact binary format by Garmin. Watches and bike computers write one FIT file per activity, with GPS points, time, speed and data from heart-rate, cadence and power sensors.
FIT files cannot be opened in a text editor or a map program. Converting FIT to GPX gives a track that any app, map or website can load; KML shows it in Google Earth and CSV turns the points into a table. Convert.Online reads FIT but does not write it.