Top 12 Bikini-Body Transformations

#11: Heidi Klum: Klum was reportedly under major pressure from Victoria’s Secret to lose weight after giving birth. She used circuit training to whip herself into shape. “Circuit training combines cardio and strength training, so it’s like two workouts in one,” Sass said. “When you’re trying to rebound from a pregnancy, both of those are critical.” (Photos: Splash News)