Visitors are welcome to come and watch any class and speak with instructors before or after class (even Grand Master Hur-nan Kimm Yong Sup himself, if available). Please note that black belt classes are closed-doors (no public viewing). Brown belt classes are open for training to all adults, however emphasis is on development of brown belt students and advanced techniques. Youngsters Hap Ki Do classes are for 5-12 year old children and are of shorter duration.