Fitness model Jen Selter showcased her insane physique in her latest Instagram update, flaunting her chiselled abs for her 12.8 million Instagram followers. Jen didn’t specify a location in the post, but she appeared to be in some type of workout studio. She stood on a wooden plank floor, and there were several pieces of fitness equipment in the background, including foam rollers, Bosu balls and an aerobic step.