3 Essential Weight-Loss Tips From Rihanna, Kim Kardashian, and Amy Schumer's Trainer

Harley Pasternak has shaped some of Hollywood’s strongest, healthiest bodies. From getting the already-fit Halle Berry in even better shape for Catwoman to training Amy Schumer for her role in Trainwreck to keeping Ariana Grande, Jessica Simpson, and Kim Kardashian camera-ready, he knows a thing or two about helping women shape up. So of course,…