The primary muscles responsible for generating the explosive hip rotation needed for a strong Ura-Mawashi-Geri (spinning back kick), are the Gluteus Maximus, the Gluteus Medius, and the hip rotator cuff muscles (Piriformis, Obturator Internus, Obturator Externus, Gemellus Superior, Gemellus Inferior, and Quadratus Femoris) of the kicking leg, along with the Obliques of the core.....
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