I understand it is only possible to upload activities on Garmin Connect.
I have several friends who have a Garmin Forerunner and we've been using Garmin Training Center for years to create and share or training plans through download/upload functions.
This should be a feature available on Garmin Connect. I want to be able to upload on GC all the workouts I already programmed on GTC. Creating workouts is time consuming. One might even expect to be able to directly share them with your GC connections.
Thank you for your feedback.