Miami City Ballet corps de ballet dancer Christina Spigner has always suffered from foot cramps. But the problem was especially troublesome during the company's 13-show run of Ballet Imperial, a hallmark of Balanchine's demanding choreography. “We're onstage for such a long time and not just standing and posing, but doing a lot physically," says Spigner. “My feet would cramp up and it was painful. That's a hard thing to recover from onstage."