. >> yeah, you should extend it joseph varga, and a russian born star of the dutch ballet. he calls her one of his muses. >> when you are choreographing for a ballerina. you almost take on, you become her in a funny way. >> you know everything has to pass through me. so much of communicating what it is you want to a dancer is about showing. so, yes, i do i have to play the man. i have to play the women. >> nobody ak sthactually sees m stage. but i do got to per for. >> just arms out. can you walk with her, joseph. >> you are pushing dancers to do athletic things that go across the boundary almost. >> dancers love to be challenged. we come up with crazy idea sometimes just to, to see, to see how far we can push. i will push until i am sure that ? ? >> reporter: once in performance it looks fluid and effortless. wheeldon's reputation has been built on intimate duets like this, with difficult but beautiful lifts and partnering. >> to watch the full report go to cbsnews.com and click on "60 >>> the u.s. women's gymnastics team is now dominating a sport it used to struggle with.