This will provide an export of all your associated Garmin data.
From a web browser go to Garmin Account Data Management.
Sign in. (If already signed in move to next step)
Select Export Your Data.
Select Request Data Export.
Your request will be submitted and a download link will be emailed to you. Links typically are sent in 48 hours but can take up to 30 days. For a review on the file types you can expect to receive, review the opening statement at the beginning of this FAQ.
NOTE: If you are looking for the individual activity data to upload to a new account or a third-party site you can find them by navigating to "DI_CONNECT > DI-Connect-Fitness-Uploaded-Files" and opening the .zip files contained within.