Need some motivation to workout? Here's checking out Yoona's abs. The K-pop star sure is proud of them, and after all, wouldn't you be too if you had abs like her's? You'd probably be showing it off as often as she did / does.

1.


2.


3.


4.

5.


6.


7.


8.


9.


10.


11.


12.


13.