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How to Do Stability Ball Jackknife — Form, Muscles & Tips

Learn how to do the Stability Ball Jackknife: step-by-step form, muscles worked, exercise ball setup, and common mistakes. Free workout tracker included.

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How to perform this exercise

  1. Get into a push-up plank with your shins resting on a stability ball.
  2. Keep your arms straight and core tight.
  3. Roll the ball toward your hands by bringing your knees to your chest.
  4. Pause briefly, then extend back to the starting plank position.
  5. Repeat in a controlled manner.