Left fist: Stand in the left preparation posture, with the right hand still, clench the fist with the left hand, with the fist back up, the fist heart down, and punch straight forward, with the arm straight, the ear level and the fist back parallel to the arm. When punching, keep your mouth closed and your teeth clenched. Lift your shoulder slightly, close to your left face, and twist your hip slightly to the right to keep your center of gravity stable. Look ahead.