Sit-up

This simple exercise strengthens your abdominals and hips. Perform this movement cautiously if you have lower back problems, and don’t do it if you feel pain.
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Sit-up
  1. Lie on your back with your knees bent and your feet flat on the floor.
  2. Lace your fingers behind your head.
  3. Curl your body up by pulling your torso toward your knees.
  4. Return to your original position.