NPR talks 'Black Swan' with Natalie Portman, who studied ballet as a kid. Did not know that.
The actresses trained for hours a day with a ballerina from the New York City Ballet. By the end, Portman was dancing several hours a day, swimming miles and cross-training, losing almost 20 pounds in the process. Her body, she says, paid a price: Her toenails fell off, her feet became calloused and she dislocated a rib during a lift.