The ability to share your efforts in the game to Strava is already in game. To save your Strava Fit Files, User icon (top right corner of most screens) > Profile > Data Handling > Connect, which will redirect you to Strava. 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.
You can also upload the game's Fit Files manually to other applications (e.g., Garmin). Profile > Data Handling, and check the Save Fit File Locally box. After the activity is complete, the FIT file will be in the drive on which the game was installed, in Program Files/Smash Your Fitness/Rides.
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