The Gymnastic Ball has a diameter of 22 cm and is perfect to add the elements of strength, intensity, and core balance to your workout. Durable balance ball. Ideal for aerobic exercise-tone your muscles. improve both your core strength and your natural balance. Size:22”/55cm (without dvd/with pump). How to size your stability ball?It is important to choose the correct size of ball and have it inflated properly. When seated on the ball, your thigh should be parallel or slightly above parallel to the ground. For those with back pain, a slightly larger ball is often better, so the thigh is above parallel.
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