Alexandra Daddario's body is giving us total #fitnessgoals! The 36-year-old actress wowed her 22.4 million followers on Instagram with a snapshot of her slim physique in a tight-fitting black onesie.
Read on to learn about the activities that help her stay in shape, as well as the photographs that prove they work—and don't forget to check out the 30 Top Celebrity Swimsuit Moments to become beach-ready too!