“At 41, Sylvie Guillem is reinventing herself. Having become perhaps the most celebrated ballerina of her generation, she is now becoming a contemporary dancer. As they exit their 30’s, most dancers try to minimize risk to extend their time on the stage. But ballet’s reigning diva is embracing it. Only a handful of ballerinas make it past 40, so Ms. Guillem, bored by the classics and determined to test new forms and her own limits, is exploring her options while she still has them. And she is doing so by performing the most physically demanding movement of her career.”