Flexing Girls @ SheFlexes.com

Why do so many people flex their arms when they're having their picture taken, even if they don't have any muscles to show off? The flex pose is to amateur photography what the "pinch your nose, pretend you're diving" move is to the dance floor: kind of cheesy, but guaranteed to get a laugh when you don't know what else to do. Whatever the reason, it doesn't stop us from loving the photos on this site—because no matter what pose these girls are in, a lot of them are pretty hot.-J. Martinez

Art KrimeZ Page of Natural but Cool Flexin Girls (sheflexes.com)

Previously: Meet Britt Miller, Pauline Nordin's Workout, Digital Amazons, Live @ FemaleMuscle Live, SheMuscle