First, what you are describing (sharing a TR for workouts with another user) is essentially a violation of the TR Terms & Conditions, since TR is a single-user service.
Outside of that, there are no built-in functions for excluding workouts from the AT functions. There is a related feature request that is asking for the option to exclude them but related to a different use case.
I am tagging @IvyAudrain to review this and give you the fully official TR response as needed.