How do you use a medicine ball to strengthen your back?

Ball curls
  1. Lie on your back with your ankles resting on the ball, knees straight.
  2. Use your legs to roll the exercise ball toward you. Allow your knees to bend and move closer to your chest.
  3. Pause briefly, and then roll the ball to the starting position. Try to keep the ball rolling straight.
  4. Repeat 8 to 12 times.
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