Miley Cyrus' abs for $15? Star's Pilates instructor Mari Winsor

The 19-year-old star credits Mari Winsor Pilates for her new found abs, practicing several times a week to maintain her fit figure.

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Mari Winsor, celebrity fitness trainer who worked with Miley Cyrus

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Miley Cyrus' abs for $15? Star's Pilates instructor Mari Winsor

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Miley Cyrus Tones Up with Pilates, Inspires New Fitness DVD