You can use a saved workout from the library, directly on an athlete’s calendar. The workout will be automatically adjusted to the athlete’s training zones.

Steps, in brief:

1. On the Athlete’s drop-down list at the top left-hand side of your screen find the athlete you want.
   
2. Go to their Calendar, click on the Library to the left
   
3. Find the pre-build workout you prefer and Save it on the preferred date.

Find out more about it here.

You may also be interested in the following: 

1. Creating and saving a workout directly in your library
2. Creating and saving a workout in the library, while working on a training plan
3. Saving an existing workout from an athlete’s calendar to your library
4. Modifying and saving an existing workout from an athlete’s calendar to your library
5. Using a saved workout from the library on an athlete’s calendar (you are reading this)
6. Editing a workout in the library
7. Deleting a custom workout from the library