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Slide show: Core exercises with a fitness ball
By Mayo Clinic staff
Core exercises strengthen abs and other core muscles
Core exercises strengthen your core muscles, including abs, back and pelvis. You can do many core exercises with a fitness ball.
Fitness balls come in various sizes. For most exercises, you'll want a ball that allows your knees to be at a right angle when you sit on the ball with your feet on the floor. The firmer the ball, the more difficult the exercise will be.
Perform your core exercises five times. Breathe freely and deeply during each exercise. Focus on tightening your deepest abdominal muscle — the transversus abdominis — during each exercise. This is the muscle you feel contracting when you cough. As you get stronger, gradually increase to 10 to 15 repetitions.
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