Want a ballerina body? "Back away from the barre," says Brynn Jinnett, 27, a Harvard University-educated former professional ballerina who danced in the film, Black Swan.

Jinnett, who'd been dancing since the age of three, was frustrated by the fitness trend of barre method classes. She'd taught at various New York City studios, but knew that the way to be a lean fat-burning machine isn't to do the sort of quasi-plies and other exercises Jinnett calls "baby ballet."
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