50-Plus Fitness Association Devoted to information about, motivation toward, and participation in exercise and fitness while aging. http://www.50plus.org/

Senior Health, from About.com Links, articles, and information on senior health and fitness. http://seniorhealth.about.com/

SeniorWorld Online Health, fitness, and nutrition articles for seniors. http://www.seniorworld.com/

Geri-Fit Vendor of a 45-minute weight training workout for older adults, also providing information on osteoporosis. http://www.gerifit.com

Karlsigma's Fitness Philosophy Tips for diet, nutrition, exercise, fitness, mental health, and longevity, from a retired scientist. http://members.aol.com/Karlsigma/index.html

Accent on Health Motivation, inspiration and resources with tips on whole body conditioning for people over 50. http://www.accentonhealth.com/

Emelina's Fitness Resources and products for health, self-esteem, bone density, longevity, lean body, shaping, high metabolism. http://www.emelina.com/

Fitness First for Women and Seniors Center designed to accommodate the unique needs of women of all ages and senior citizens. (New Jersey) http://www.fit1st.com/

Portraits of Senior Athletes "Growing Old is Not For Sissies" Two black and white photography books about senior athletes doing the sports that they love best. http://ettaclarkphotography.com

Walk Tall Exercise program for prevention and treatment of osteoporosis. http://www.triadpublishing.com/walktall.htm

AgeFit Senior fitness services for the older adult community. http://www.agefit.com/

Encyclopedia of Sports Medicine and Science: Aging and Exercise A comprehensive and somewhat technical article on the physiological changes associated with human aging and the positive role that exercise can play. http://www.sportsci.org/encyc/agingex/agingex.html

American Senior Fitness Association Provides senior specific fitness training, certification and resources for exercise professionals who serve older adults as well as fitness information and tips for mature exercisers. http://www.seniorfitness.net/

Senior-Fitness.com Offers information on stretching and exercises to maintain balance and prevent falls among seniors. http://www.senior-fitness.com/

Coronay Artery Rehabilitation Group A self-help, volunteer, non-profit group dedicated to promoting a healthy life style for persons with cardiac problems, with the help of cardiac specialists. http://www.carg.ca

Advice for the Aging Athlete Informative article, authored by William G. Raasch, MD, Director of the Division of Sports Medicine, Medical College of Wisconsin and Froedtert Hospital. http://healthlink.mcw.edu/article/953058816.html

Michigan Senior Olympics Information about this program which promotes healthy lifestyles by organizing state games, sports competitions, fitness, and wellness programs for individuals over 50. http://michiganseniorolympics.com/

Fit Senior Online Catalog Fitness, sports, gymnastic, aerobic equipment, as well as cycles, treadmills and related products and prices. http://www.fit-senior.com

Alexander Technique and Aging Well How this century-old method of stress reduction can help seniors. http://www.alexandertechnique.com/articles/aging

Silver Sneakers Fitness programs for seniors working in conjunction with health plans. http://www.silversneakers.com