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  • IT'S A STRETCH photo | Bethenny Frankel

Credit: Mark Von Holden/AP

Published: Monday May 13, 2013 | 07:00 PM EDT


Bethenny Frankel – who's adding Skinnygirl Daily Nutrition Bars to her line of products – demonstrates how she keeps her slender shape at the SELF Workout in the Park event in New York City on Saturday. "I go to [celebrity trainer] Tracy Anderson once or twice a week, which is my new thing," Frankel tells PEOPLE of her fitness routine. "It's really challenging and tough, and it's getting me through a rough time right now."