I've always used Endomondo training plans for my run training as they are very specific and constantly adjusted based on previous workouts.
It would be great to be able to import them into Garmin Connect as custom workouts to be sent to the watch, this would be a HUGE time saver as I am currently faced with the prospect of entering the workouts manually.
I can export them as FIT files but there doesn't seem to be any way to get them onto the watch