1) On the watch, go to App List > Workout to open the workout list.
2) Swipe down to the end of the list and tap "+".
3) You are now in the edit list mode. Select any workout to move it to anywhere in the workout list or to delete it from the list.
4) In the edit list status, swipe down to the end of the list, tap Add Workout to go to the list of all workout items, tap any workout marked with +" to add it to your workout list. You can also move it anywhere you want.
5) You can start using the edited workout list after you exit the edit list status.