Related: 12 Actors Who Massively Transformed Themselves for a RoleSometimes you need extra support, which is why svelte actress Elizabeth Rohm (“Joy,” “American Hustle”) heads to Live In Fitness whenever she can. “When my schedule allows it, I love intense, immersive workouts like the ones Eric Viskovicz crafts at Live In Fitness,” she said at the Fit Club TV Grammys event. “But in between those visits to Eric, I rely on the classics: body sculpting classes and basic weight training…