Meet the 30 Under 30 Coolest Entrepreneurs

Jon Tannen
1 of 30

Brynn Jinnett, The Refine Method

Jinnett, a professional ballerina who danced in Black Swan, wanted to help mere mortals who longed for dancer-like bodies. So she developed The Refine Method, circuits of resistance training mixed with high-intensity cardio that she teaches at her Manhattan studio. In March, New York magazine named The Refine Method the "Hottest New Workout of 2011." Jinnett plans to open a second studio in July. Read more.