American Alliance for Health, Physical Education, Recreation, and Dance (AAHPERD): A professional organization dedicated to promoting quality education programs to improve the health and fitness of all Americans.

American College of Sports Medicine (ACSM): A professional organization that provides information about the positive effects of exercise; selected articles from the ACSM Health and Fitness Journal are also available online.

American Council on Exercise: Features fact sheets on many consumer topics, including choosing shoes, cross-training, steroids, and getting started on an exercise program.

American Heart Association: Just Move: Provides fitness news, fitness assessment tests, and practical advice for people of all fitness levels; visitors can also use online fitness diary to track their progress and sign up for a personal trainer who will send motivational e-mails to help ensure steady progress.

American Running and Fitness Association: Provides helpful articles about training, injury prevention, exercise equipment, and developing health-related fitness.

CDC National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP): Physical Activity Information: Provides information on the benefits of physical activity and suggestions for incorporating moderate physical activity into daily life.

Cooper Institute for Aerobics Research: Includes scientific updates, continuing education courses, and health products and publications.

Disabled Sports USA: Provides sport and recreation services to people with physical or mobility disorders.

Exercise: A Guide from the National Institute on Aging and the National Aeronautics and Space Administration: Provides practical advice on fitness for seniors; includes animated instructions for specific weight training and flexibility exercises.

Federal Trade Commission: Consumer Protection—Diet, Health, and Fitness: Provides several brochures with consumer advice about purchasing exercise equipment.

Fitness Management Magazine’s Fitness World: Includes current issues of the magazine, information about exercise books and videos, news highlights related to exercise, and answers to frequently asked questions.

Human Anatomy On-line: Provides text, illustrations, and animation about the muscular system, nerve-muscle connections, muscular contractions, and other topics.

National Association of Governor’s Councils on Physical Fitness and Sports (NAGCPFS): Promotes physical fitness, sports, and healthy lifestyles; site includes information on how to contact local chapters and how to obtain National Employee Health and Fitness materials.

Physical Activity and Health: A Report of the Surgeon General: Features the text of the Surgeon General’s report, which provides a summary of the evidence for the benefits of physical activity as well as recommendations for activity and exercise.

Physical Activity and Health Network: Provides resources and links on the relationship between activity and health.

Physical Activity Guide: Developed by Health Canada and the Canadian Society for Exercise Physiology, this guide includes many suggestions for incorporating physical activity into everyday life.

Physician and Sportsmedicine: Provides articles from the print journal; many cover consumer-oriented topics such as selecting equipment and fitness facilities, preventing and treating exercise injuries, and developing a successful fitness programs.

Phys: In Fitness and In Health: A commercial site with information on a variety of fitness and nutrition topics; includes a forum, chat room, and an online fitness encyclopedia with information on many sports and activities.

Shape Up America!: The fitness center includes fitness assessments, information on the benefits of exercise, tips for overcoming barriers, and tracking forms.

Sport Science at the Exploratorium Provides answers to questions about sports, links to other sport science sites, and special exhibits about cycling, baseball, hockey, and skateboarding.

University of Michigan/Muscles in Action: Interactive descriptions of muscle movements.