JKD practitioners believe they should direct their kicks, as in Wing Chun, to their opponent's shins, knees, thighs, and midsection. These targets are the closest to the feet, provide more stability and are more difficult to defend against. Maintaining low kicks utilizes the principle of economy of motion by reducing the distance a kick must travel, thus minimizing the "time" element. However, as with all other JKD principles nothing is set in stone. In typical JKD style, if a target of opportunity presents itself, even a target above the waist, one could take advantage and not be hampered by this principle.