Combat Vector Core Training by Robb Rogers, M.ed, CSCS

The core is an area of the body roughly defined as from the armpits to the knees. Most movement is initiated by or occurs through the core. For instance, in jumping the area of the core will move toward the ground as the arms reach back or up and the legs flex. Upon forceful extension of the arms and legs the body is propelled upward with the force moving through the core to the blocked arms. When sprinting, the arms and legs are dynamically moved through out the range of motion in order to develop the velocity of the body, propelling the core forward. These ballistic arm and leg movements occur around a generally stable, strong core. If the core lacks proprioceptive strength, (strength with balance and stability) then energy leakage can occur upon force production or force absorption and the power generated by the limbs and transferred through the core can be lost, resulting in less power generated for a technique or a compromised ability of the body to absorb force properly. During force reduction, the pattern of force reduction compensation can lead to injury due to core weakness and imbalances.

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S B Coaches College - Combat Vector Core Training