There's no question that The Vampire Diaries star Nina Dobrev has a great body. While she often credits her slim physique to yoga, her personal trainer, Steve Moyer, says Nina also loves some other ab-shredding workouts as well. If you've been dying to bust out your bikini this summer, it's not too late to get in a few Nina-approved workouts. This video shows you some great moves that will definitely have you saying "ouch!" tomorrow!