A worldwide organization of 16,000 professionals who research the medical aspects of sport and educate the public on the health benefits of exercise. The ACSM also offers many free brochures, videos, and audiotapes. Mailing address: ACSM National Center, P.O. Box 1440, Indianapolis, IN 46206-1440. Voice: 317-637-9200. Fax: 317-634-7817. Internet: www.acsm.org.