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

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

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/

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.carg.ca/

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

New Mexico Senior Olympics Information on their annual state games and events held throughout the year. Includes a quarterly newsletter, results, events, records and senior profiles. http://www.nmseniorolympics.org/

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://www.ettaclarkphotography.com/

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

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

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