“…active hip is best understood as the use of an actively locked lumbar extension and actively shoved-out knees, which results in a below-parallel squat that incorporates a stretch reflex using all the muscles of the posterior chain in the most optimal way possible. The active hip gets the thighs out of the way of the pelvis so good depth can be more easily obtained. At the same time it makes the squat stronger because of the now-active use of the external rotators holding the femurs out so that both external rotators and adductors can contribute to hip extension. This produces a more effective use of more muscles over a wider range of motion.”
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