Export the original file
Download a FIT or TCX file from your training platform. A ZIP is also suitable for multiple FIT files.
Practical FIT and TCX guide
Import, check and troubleshoot FIT and TCX files
A practical guide to choosing the right workout file, importing it into AI Athlete, checking the result and resolving common FIT, TCX and ZIP issues.
Start in three steps
Use the original file exported by your training platform when possible and check the core workout data after import.
Import it in workouts
Sign in, open the workouts view and choose a FIT, TCX or ZIP file to upload.
Check the result
Review sport, date, duration, distance, heart rate and laps, then add your own feedback.
Which file format should you choose?
An original FIT file usually contains the most detailed device and sensor data. TCX is well suited to transferring core workout data.
- FIT: prefer it when the platform offers an original workout-file export.
- TCX: suitable for route, time, distance, heart-rate and lap data when present in the file.
- ZIP: use it as a bundle of supported FIT files; do not rename file extensions manually.
Export from a device or platform service
Menus in Garmin, Polar, Suunto and COROS services may change. Look for an export or download action in the workout detail and prefer the original file.
- Export one specific workout when you want one-session analysis.
- Keep the original file unchanged until the import succeeds.
- File-based import works independently when an automatic connection is unavailable.
If the file will not import
First rule out an incorrect file type, a broken export and unsupported ZIP contents.
- Check that the file ends in `.fit`, `.tcx` or `.zip` and was not renamed manually.
- Export the same workout again and retry with the original file.
- A ZIP must contain a supported FIT file; renaming another archive does not help.
- If data is missing, check whether it was present on the source platform.
Privacy and safe review
A workout file may contain routes, location, heart rate and other sensitive training data. Upload only your own file or a file you are authorized to process.
- Check what data the file contains before uploading.
- AI analysis uses relevant context to create the output you request.
- AI Athlete is a training support tool, not a medical device.
Questions and answers
Short answers before importing your first file.
Is FIT always better than TCX?
Not always, but an original FIT file often contains more device and sensor detail. When FIT is unavailable, a valid TCX file may still provide sufficient core workout data.
Is an automatic connection required for import?
No. Manual import of FIT, TCX and supported ZIP files works separately from automatic connections. Connection availability depends on the service and account configuration.