As lower range of motion exercises are mastered by the lower body, higher range of motion exercises may be employed. During this progression, the involvement of the hip extensors increases at a higher relative rate of force production than that of the knee extensors due to a relatively larger muscle mass. At the depth at which the femur is parallel to the floor, a tipping point exists in which the hip extensors outstrip the knee extensors as the dominant force producers of lower body, multi-joint, extensor chain movement.
It is not enough to train the knee and the hip from a pure extensor chain perspective. The flow from knee-dominant to hip-dominant force production must occur through all axes of the pelvis.
The best way to accomplish this is through the introduction of oblique angular forces that force either a change in absolute lateral or rotational position, or require the trainee to maintain an unbalanced fixed position, thus creating a relative lateral or rotational movement.
Training and testing in this way improves the hip rotators as well as the as the knee and hip extensors. Indeed, it also improves the abductors, adductors, and ultimately, the core, because these muscle groups all serve to aid in hip rotation, and also transduce lower body forces. There is therefore a direct transfer to field skill, which must be multidirectional in nature.
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