“I think they were really committed to being as accurate as possible, so they wanted a principal dancer, a real ballerina,” Boylston says. “Justin Peck, the choreographer, is a good friend of mine — we had worked together before on our own film that premiered at Tribeca Film Festival a couple of years ago. He called me and was like, ‘I think you’d be a great fit for this project.’ And I was like, Francis Lawrence? Jen Lawrence? Sign me up.”