BBC News

The art of dancing Swan Lake's black and white swans

Ballerina Zenaida Yanowsky, a principal dancer at the Royal Ballet, talks Will Gompertz through the art of playing the twin roles of the black and white swans in the classic ballet Swan Lake.

This is the same challenge faced by actress Natalie Portman's character in the film Black Swan, which is released in the UK on 21 January.