Slide show: Core-strength exercises with a fitness ball ...Explore further
2021-8-27u2002·u2002Core-strength exercises strengthen your core muscles, including your abdominal muscles, back muscles and the muscles around the pelvis. You can do many core-strength exercises with a fitness ball. In general, use a fitness ball sized so that your knees are at a right angle when you sit on the ball with your feet flat on the floor.
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