How to properly do a jack knife exercise on a physioball in thisfree exercise video. Expert: James Fitzgerald Contact: www.mvpfitness.us Bio: James Fitzgerald is a member of the American College of Sports Medicine & certified in Personal Training and Group Kickboxing through Fitness Instructor Training of Stafford, Texas. Filmmaker: Christian Munoz-Donoso

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Tags: Ball, Fitness, JACK, Knife, Physioball, Stability, tips.

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