Build A Stronger Core
One of the best ways to strengthen your Core (abs and back muscles) is with a balance ball. They help build strength, stability, flexibility and coordination through low-stress, low impact exercises. But remember, for optimal results your height matters! So make sure you get the right ball size for your height.
Ball Size - Your Height
55cm = 5'-2" to 5'-6" (Purple)
65cm = 5'-6" to 6'-4" (Blue)

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