Exercise balls are a useful workout tool for strengthening your core and assisting with balance exercises, such as pelvic thrusts. The ball can be difficult for beginners because it creates an unstable surface, but with a little practice
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Stability Ball™ with pump - 55 cm (Black) for Pilates
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Ball exercises, Excercise ball workout, Stability ball exercises
Senior Standing Stability Ball Exercise - Fitness With Cindy
