If you're looking for reliable and scientific information on all things fitness, especially from official, government or authority sites, the following list will give you all these and more:

American College Of Sports Medicine

American College Of Sports Medicine is the largest sports medicine and exercise science organization in the world, dedicated to promoting healthier lifestyles for people around the globe via practical application of sports medicine and exercise science.

www.acsm.org

American Council On Exercise

American Council On Exercise is widely-recognized as America's authority on exercise. It is a non-profit organization committed to enriching one's quality of life through the dissemination of information on safe and effective exercise and physical activity programs.

www.acefitness.org

National Council On Strength & Fitness

The National Council On Strength & Fitness is a leading authority in the health and fitness industry, providing support services, educational programs, public outreach and professional credentialing for the Personal Training profession.

www.ncsf.org

President's Council On Physical Fitness And Sports

The President's Council on Physical Fitness and Sports, via its programs and partnerships with the public, private and non-profit sectors, serves to promote health, physical activity, fitness and enjoyment for people of all ages, backgrounds and abilities through participation in physical activity and sports.

www.fitness.gov

Singapore Health Promotion Board

Singapore Health Promotion Board plays the official role of main driver for national health promotion and disease prevention programmes. Its aim is to help build Singapore into a nation of fit, healthy and happy people.

www.hpb.gov.sg

Singapore Sports Council

The Singapore Sports Council is Singapore's official agency for promoting sports and fitness in Singapore. Its vision is to create a Sporting Singapore where Sports and the pursuit of Fitness is a way of life for every citizen.

www.ssc.gov.sg