For her role as a ballerina with a bad attitude in the Oscar-nominated Black Swan, actress Mila Kunis had to transform herself into a professional dancer in a very short amount of time. Apart from mastering pointe shoes, the already-slender actress also had to lose weight—quickly—and reportedly dropped below 100 pounds. “The preparation was: get as skinny as you can, as fast as you can,” Kunis said, in an interview with MTV. “[I danced] seven days a week, five hours a day, and was put on a 1,200 calorie diet—for a total of five, six months.”

Gruelling workouts and severe calorie restriction are not healthy ways to lose weight, but incorporating a dance-based workout into your regular fitness routine can be a lot of fun. Channel your inner Black Swan with Ballet Bootcamp or a Zumba class.