A New York City Ballet backstage slideshow.
Alberda, who joined the corps de ballet in 2006, has been providing a rare glimpse inside this cloistered world, posting pictures of his fellow dancers to Instagram all winter. This is the most punishing time of year, when they work 12-hour days for 14 weeks without a break. Alberda says they struggle with the long stretches of rehearsal indoors, under artificial light. “We really don’t see the sun,” he says. “But there’s also something really spectacular about it.”