When it feels like everything's already been done, Monica Bill Barnes still pushes boundaries. Her hit collaboration with "This American Life" host Ira Glass mixed dance with radio-style storytelling, and her Happy Hour series embraced the idea of an office-party-meets-karaoke-meets-dance experience. And although plenty of choreographers are setting site-specific work in museums these days, Barnes takes it a few steps further—and leads her audience through an aerobic workout in the Metropolitan Museum of Art.

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