Jack Knife Abdominals with Knees on Stability Ball

by Anthony Carey, MA

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The jackknife abdominals using the stability ball is predominantly a sagittal plane exercise that will put a big eccentric demand on the abdominals. Start by keeping the upper body fixed as the knees move to the hands and away from the hands. Get both feet on the ball and put your hands on the floor in a pushup position. From here, draw the ball in towards your chest and as you go back you will need to eccentrically control the weight of your center of gravity, which is around the hips, to keep it from dropping down. Now, if you want to progress this exercise, stabilize on your toes on the ball and as you come up you'll come up and pike, making the lever much longer from the toes to the hips and placing a greater demand on the abdominals as you do this.

About the Presenter

Anthony Carey, MA

Anthony Carey, MA IDEA Author/Presenter

Anthony Carey, MA, owns Function First in San Diego, California. He holds a master?s degree in biomechanics and athletic training, and is an internationally-recognized speaker on biomechanics, posture, motor control and musculoskeletal pain and function. As a best-selling author, his work has been featured in the New York Times and Time Magazine. Anthony is also the inventor of the Core-Tex.