What Size Yoga Ball Do I Need? Use this Exercise Ball Size Chart to Choose the best one for you - The Yoga Nomads
Exercise Ball (55 cm, 65 cm, or 75 cm)
Amazon.com: SmarterLife Workout Exercise Ball for Fitness, Yoga, Balance, Stability, or Birthing, Great as Yoga Ball Chair for Office or Exercise Gym Equipment for Home, Premium Non-Slip Design (45 cm, Black) :