It's possible to use the exercise 'workout' on the tracker. If the exercise isn't displayed on the Surge to choose from, the exercise shortcuts to appear on the tracker can be configured on the devices settings page (fitbit.com) or from within the fitbit app phone.
On fitbit.com:
https://www.fitbit.com/user/profile/edit
In the menu, click the link which displays your tracker. On the devices settings page it's possible to add workout to the exercises list. After sync'ing the activity will appear on the Surge in the exercises menu.
