Emma Stone's turn as tennis legend Billie Jean King in the 2017 film Battle of the Sexes earned rave reviews from critics. A big part of Stone's phenomenal performance was her body transformation—she didn't need to just talk and act like Billie Jean, she needed to look and move like her, too. Stone teamed up with Walsh, who she'd previously collaborated with to help her prepare for La La Land, to get it done.
"It was a lot, a lot, a lot of weight lifting. And then, after three weeks, you're like, "I can lift this?! I can do that!" It just becomes very addictive," Stone told Entertainment Tonight.
Stone was ultimately able to add 15 pounds of muscle thanks to a steady diet of strength builders like Deadlifts, Farmer's Walks, Hip Thrusts, Pull-Ups, Weighted Push-Ups and Sled Pushes and Pulls. She generally did about two strength workouts for every one cardio workout during her preparation, as too much cardio can cannibalize strength gains. Stone used the VersaClimber, which LeBron James has called his favorite piece of gym equipment, for her conditioning.