This kick is practiced from a fighting stance, one foot forward, the other 45 degrees to rear.
Bring the back leg up in an arc toward the front of body, keeping the knee high, with the kick moving across your center line.
Foot extends as knee moves toward apex of its arc.
Kick arcs upward and strikes high to the side of the head. It continues on after impact and is returned to the ground under control, often followed by a spinning technique with opposite hand or foot.