Slide show: Core-strength exercises with a fitness ball
Photo of woman doing advanced plank with fitness ball
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When you're comfortable doing the plank with the fitness ball, add the advanced plank for even more core strength:

  1. Lie on the ball on your stomach, with your feet touching the floor behind the ball. Lean forward until you touch the floor with your hands.
  2. Walk your hands away from the ball until you feel the ball reach your upper thighs (A). Keep your shoulders directly above your hands.
  3. Tighten your abdominal muscles.
  4. Push your body weight forward until your shoulders are in front of your hands and the ball is beneath your shins (B). Hold for three deep breaths.
  5. Return to the start position and repeat.
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