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Exercise Ball (55 cm, 65 cm, or 75 cm)
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Amazon.com: Gaiam Kids Balance Ball - Exercise Stability Yoga Ball, Kids Alternative Flexible Seating for Active Children in Home or Classroom (Satisfaction Guarantee), Blue, 45cm (2.09 Pounds) : Sports & Outdoors
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The Pros and Cons of Using a Yoga Ball - YOGA PRACTICE
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Sample Class: Yoga on the Ball - IDEA Health & Fitness Association