Kurt Froman trained Mila Kunis and Natalie Portman for Black Swan, and more recently he’s been training Jennifer Lawrence for the upcoming Red Sparrow. “One of the biggest things, I think, for a non-dancer is just understanding dancers hold their arms from their backs. … When I was working with Jen, as well as with Mila and Natalie, getting them used to holding their backs that way and understanding that their arms are an extension of their backs, that’s the first thing that I need to instill in them and I have to remind them of that the entire time.”