Crunch

The Crunch is one of the most common abdominal exercises. It primarily works the rectus abdominis, which extends up the middle of your abdomen.
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Crunch
  1. Lie on your back.
  2. Place your hands behind or beside your head.
  3. Keeping your feet flat on the ground, bend your knees at a 90-degree angle.
  4. Using your abdominal muscles, pull your upper body up until your shoulder blades are a few inches from the ground.
  5. Slowly return to your original position. 
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