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Stability ball jackknife exercise instructions and video

Stability ball jackknife exercise instructions and video Stability ball jackknife. A compound leg and core exercise. Target muscles: Iliopsoas (not abs. Visit site to learn why). Synergistic muscles: Tensor Fasciae Latae, Sartorius, Pectineus, Adductor Longus, Adductor Brevis, Rectus Abdominis, Obliques, Adductor Magnus, and Gluteus Maximus. Dynamic stabilizers: Hamstrings and Rectus ...

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