Central Line Area is the space between the Center Line and the Reciprocal Line. This area constitutes the work area in the Wing Chun system. In this work area, the Wing Chun practitioner can simultaneously protect and attack with both arms and legs. This is defined in the beginning of all Wing Chun forms by crossing the hands low and high. When the hands are uncross, the Wing Chun practitioner is out of his Central Line Area. The aim of the Wing Chun practitioner is to keep the Central Line inside the Central Line Area.