You'd never know that Halle Berry celebrated her 46th birthday in 2012. Her age-defying secret is trainer Nat Bardonnet, whom she works out with three times a week for an hour at a time. "I do cardio, very light weights, and exercises that use a lot of my own body weight," Halle says. Want to get Halle's toned shoulders? Here's a Halle Berry-inspired arm and shoulder workout that'll get you bikini-ready for Spring.