Initial exercise styling

![exercise](https://cloud.githubusercontent.com/assets/770432/3999268/1cbc3c46-294f-11e4-9c35-eb0e04ba3fac.gif)

Ok, wasn't quite sure what you were shooting for here. I like the idea of showing the progress of the completion of the exercise, but do you think it would be better served as showing something like 15/25 completed. At first glance I thought you were attempting to calculate the average for the exercise.