First, double-check that your .FIT files are set to save locally. If not, User icon (top right corner of most screens) > Profile > Data Handling > Connect. You will be redirected to Strava where, after sign in, it will walk you through the connection process. Your Fit File will then be saved and uploaded to Strava each time you ride. Confirm the "Save Fit files locally" box is checked to save it locally (e.g., if you use Garmin).
After you complete a physical activity, you can find your fit file here: The drive the game is installed on/Program Files/Smash Your Fitness/Rides. Fit files will be created for each activity, not your entire session. You can manually upload these fit files to other fitness tracking software, as well, such as Garmin Connect. We are continuously working to integrate with different fitness tracking software.
Make sure to exit the game properly with the Exit button (see FAQ "How do I exit the game") so the fit files will be properly created and and saved.
For more help, contact Support@SmashYourFitness.com