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Knee extension on ball (core)
- Sit up straight on an exercise ball with your feet flat on the floor, hip-width apart. As you do this exercise, avoid slumping your shoulders and arching your back.
- Rest your hands on the ball near your hip or a steady object next to you. (If you feel very stable on the ball, rest your hands in your lap.)
- Slowly straighten one leg at the knee. Slowly lower it back down. Repeat with the other leg.
- Repeat 8 to 12 times with each leg.
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