TrainingPeaks and Garmin have teamed up to help streamline your workout upload process. You can now have Garmin data files automatically sent to TrainingPeaks using the new AutoSync. Once set up, every data file that is uploaded to Garmin Connect will sync to TrainingPeaks where you and/or your coach can review your workouts in the mobile or web app. You will no longer have to use Device Agent or find files in your computer directories.
Click this link to get it set-up: TrainingPeaks.com/GarminConnect.
P.S. Need more help, use this tutorial to set up Garmin Connect AutoSync with TrainingPeaks.