Joel Kolenchuk, owner of Bob Deane’s Black Belt Academy, teaches a young class at the club’s Christmas sale, last week. Along with the sale, Kolenchuk demonstrated Teuk Gong Moo Sool, a Southern Korean military martial art that he is studying to bring to the club. On hand at the sale was a bevy of gear, from dobok to sparring gloves, along with baked goods brought by members of the club.