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Amazon.com: DYNAPRO Exercise Ball – Extra Thick Eco-Friendly & Anti-Burst Material Supports Over 2200lbs, Stability Ball for Home, Yoga, Gym Ball, Birthing Ball, Swiss Ball, Physical Therapy (Black, 45CM) : Sports &
Balance on the Ball: Exercises Inspired by the Teachings of Joseph Pilates: Crawford, Elisabeth: 9780970371607: Amazon.com: Books
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