Exercise Ball, Pilates Yoga Ball for Fitness Pregnancy, Stability Balance Ball Chair with Quick Pump, Anti-Burst Workout Gym Equipment for Home, Office (Purple 55cm) - Walmart.com
How Do I Know What Size Birthing Ball to Get? HERE's HOW! - YouTube
Amazon.com: KEEP Exercise Ball - Balance Yoga Balls for Working Out,Excersize Birthing Ball for Pregnancy - Fitness Ball for Core Strength and Physical Therapy, with Inflator Pump,65cm,Navy Blue : Sports & Outdoors