A regular on our Hump Day posts, Jen Selter -- muse of the Belfie, inspiration behind #Seltering -- is perhaps known above all as the owner of the Best Butt on Instagram.

It's a prestigious title, to be sure, but she's so much more than that. The girl is an absolute fitness freak, and God bless her, she likes to share the results of her squat reps with the rest of us. You can follow Jen and her excellent posterior on Instagram, Facebook, Twitter and Tumblr.