The Fitness League
National network of locally based exercise classes, suitable for all ages and abilities, available in over 300 venues across the UK.
http://www.thefitnessleague.com/

Association of Women's Fitness
Resource site on women's fitness and health, with a special focus on preventing home gym training injuries.
http://www.association-of-womens-fitness.org

National Association for Health and Fitness
A not-for-profit organization that exists to improve the quality of life of every individual in the United States through the promotion of physical fitness and healthy lifestyles and by fostering and supporting Councils for physical activity, health and sports.
http://www.physicalfitness.org/

American College of Sports Medicine
Promotes fitness, health and quality of life through research, education and practical applications of sports medicine.
http://www.acsm.org

IDEA
Supports the world's leading health and fitness professionals with credible information, education, career development and leadership.
http://www.ideafit.com

National Center on Physical Activity and Disability
NCPAD encourages persons with disabilities to participate in regular physical activity to promote healthy lifestyles and prevent secondary conditions.
http://www.ncpad.org/

International Yoga Federation
Lists the national and continental yoga organizations.
http://fiy.yoganet.org

American Society of Exercise Physiologists
Certification (EPC), undergraduate academic accreditation, electronic research (JEPonline) and publications (PEPonline), licensure through state affiliates.
http://www.asep.org

Moms In Motion
Programs provide fitness training for women and raise money for local charities.
http://www.momsinmotion.com

WorldStar Fitness, LLC.
Confers titles for women of different age groups. Includes judging criteria and application form.
http://www.mrsfitness.com/

AFAA: Aerobics and Fitness Association of America
Job listings, certification workshops, continuing education, forums.
http://www.afaa.com/

National Gym Association, Inc.
A nonprofit organization maintaining industry standards, with details of contests, and career information.
http://www.nationalgym.com/

American Council on Exercise (ACE)
Non-profit organization, sets certification and education standards for personal trainers and group fitness instructors.
http://www.acefitness.org/

Fitness Institute Australia
Providing industry standard certificate courses for instructors and personal trainers.
http://www.fia.com.au

International Fitness Association
Certification for kickboxing aerobics instructor and fitness trainer. Free Fitness Manual.
http://www.ifafitness.com/

International Fitness Professionals Association
For personal trainers, aerobics instructors, fitness center staff. Tampa, FL.
http://www.ifpa-fitness.com

National Academy of Sports Medicine
Addressing fitness, sports performance, and sports medicine. Live, online, and home-study courses.
http://www.nasm.org

National Council on Strength and Fitness
Personal training certification and continuing education for the fitness professional.
http://www.ncsf.org

National Federation of Professional Trainers
Providing trainer certification for over 16 years. Directory, free software, NFPT magazine, forums.
http://www.nfpt.com/

National Strength Professionals Association
NSPA has certified over 4,500 professional fitness instructors and personal trainers.
http://www.nspainc.com

Natural Fitness Trainers Association
Certification for natural fitness trainer. Natural training methods are approved by the NFTA advisory board.
http://www.naturalfitnesstrainers.com/

Aquatic & Fitness Professional Association International
Aqua aerobics personal trainer certifications, water workshops, continuing education, senior fitness.
http://www.aquacert.org

National Strength and Conditioning Association
Non-profit association dedicated to facilitating the exchange of ideas in strength development as it relates to the improvement of athletic performance and fitness.
http://www.nsca-lift.org/

IHRSA
International Health, Racquet and Sportsclub Association: Organization that promotes fitness through education and sport club membership.
http://cms.ihrsa.org/IHRSA/viewPage.cfm?pageId=2

Native American Fitness Council
Fitness training and certification programs.
http://www.nativeamericanfitnesscouncil.com