Slide show: Core-strength exercises with a fitness ball
Photo of woman doing abdominal crunch exercise on fitness ball
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To do abdominal crunches with the fitness ball:

  • Sit on the ball with your feet resting on the floor, about hip-width apart. Keep your back straight. Cross your arms on your chest.
  • Tighten your abdominal muscles.
  • Lean back, as shown, until you feel the muscles in your midsection tighten. Hold for three deep breaths.
  • Return to the start position and repeat.
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