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Knee extension on ball (core)

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Knee extension on ball (core)

  1. 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.
  2. Rest your hands on the ball near your hip or on a steady object next to you. (If you feel very stable on the ball, rest your hands in your lap.)
  3. Slowly straighten one leg at the knee. Slowly lower it back down. Repeat with the other leg.
  4. Repeat 8 to 12 times with each leg.

Current as of: May 1, 2026

Author: WebMD Ignite Staff
Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

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This information does not replace the advice of a doctor. WebMD Ignite, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

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