Started in 1983, 24 Hour Fitness is one of the largest privately owned and operated wellness center chains in the world. With more than 350 clubs throughout the United States, the center s amenities include whirlpool baths, steam rooms, and basketball, volleyball and racquetball courts. It offers personal training programs that include cardiovascular, abdominal, and upper and lower body resistance workouts. 24 Hour Fitness also provides nutritional services and prepares personalized meal plans. The center also publishes a guide that contains fitness tips and health-related information. It provides supplements and vitamins for weight management. The center conducts aerobics, aquatics, yoga, Pilates and swimming classes. 24 Hour Fitness also operates a club for children that provides baby-sitting services. The center maintains a presence in Portland, Ore.