If your app works best by users working through a series of exercises in sequence, having a **Next Exercise** link will save them from having to hop back and forth from gallery to detail.

Remember that each time a user has to

1. Locate one of the thumbnails that represents an exercise that is NOT completed already. 

2. Click said exercise.

3. Complete and verify.

4. Close the modal (Not sure if this just closes on it's own).

5. Scan the list again for the next uncompleted exercise, which could be below the visible portion of the screen.