To set up the API that automatically shares data from Garmin Connect to Swim.com, you'll need to have an active Garmin Connect account.
Open up the Swim.com app on your mobile device and touch the settings tab on the lower right corner of the screen. On the settings menu, select "Integrations", then select Garmin. Select the blue connect button and you will be directed to the portal in which you will input your Garmin Connect credentials and agree to data sharing terms.
Upload .fit Files
To upload a .fit file that has been saved on a computer or phone, please go to www.swim.com on a web browser and login using your credentials. You will land on a page showing the number of swims you have completed and your total overall distance. Below this is a drop box for .fit files.
This box is a drag-and-drop option or you can click the drag-and-drop box to open a file browse menu. Please note this tool only accepts .fit files that are in the Garmin or Suunto proprietary format and only works on web browser. There is currently no option to upload .fit files to your account through the Swim.com mobile app.