18+ Exercise Ball Jackknife PNG. When done correctly, it can effectively target your core, hips, legs, lower body, upper legs and waist. Exercise ball jackknife is a strength exercise that works your abs and quadriceps.
Exercise ball jackknife is a strength exercise that works your abs and quadriceps.
Variations available (23) general and specifics. The stability ball jackknife is also known as the swiss ball and exercise ball jackknife. This ab exercise strengthens the core and the hip flexor; Preparation lay on top of exercise ball with legs and hands slightly apart.
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