This chain of clubs includes eight Courts Royal, including one at 1122 Kirkwood Road, Arlington (522-1702) and at 4317 Ravensworth Road, Annandale (256-6600) and four Sport and Health Clubs, at 4400 Montgomery Avenue, Bethesda (656-9570) and other locations. There is reciprocity between the Courts Royal clubs; members of the Sport and Health clubs share reciprocity with Courts Royal clubs only if their membership allows. The aerobics classes are primarily geared toward the intermediate and advanced level exercise and combine low- and high-impact work. Call the location near you for times of classes. Prices range from $45 to $75 monthly with initiation fees varying according to location.

This Columbia, Maryland, club has two outlets: The Supreme Court and The Athletic Club. Both offer aerobics instruction, from low- to high-impact, seven days a week. The first class begins at 6 a.m. and the last at 8 p.m. Classes are taught on a cushioned floor. Memberships begin at $27 a month, with unlimited aerobics. The Supreme Court club is at 7080 Deepage Drive, Columbia. 301/381-5355. The Athletic Club is at 5435 Beaverkill Road, Columbia. 301/730-9263.

Six different types of aerobics, ranging from body work, fat burning, cardio-condition, rhythmic, intermediate and advance, are taught. The classes are offered every day, with the first at 6:45 a.m. and the latest at 7:30 p.m., on a padded carpet surface. Drops-in pay $5 a class. Memberships start at $25 a month, with unlimited aerobics. 204 Ft. Meade Road, Laurel, Md. 953-1414.