American College of Sports Medicine - Promotes fitness, health and quality of life through research, education and practical applications of sports medicine.
American Council on Exercise (ACE) - Non-profit organization, sets certification and education standards for personal trainers and group fitness instructors.
American Society of Exercise Physiologists - Certification (EPC), undergraduate academic accreditation, electronic research (JEPonline) and publications (PEPonline), licensure through state affiliates.
Association of Women's Fitness - Resource site on women's fitness and health, with a special focus on preventing home gym training injuries.
Fitness Institute Australia - Providing industry standard certificate courses for instructors and personal trainers.
The Fitness League - National network of locally based exercise classes, suitable for all ages and abilities, available in over 300 venues across the UK.
IDEA - Supports the world's leading health and fitness professionals with credible information, education, career development and leadership.
IHRSA - International Health, Racquet and Sportsclub Association: Organization that promotes fitness through education and sport club membership.
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.
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.
National Gym Association, Inc. - A nonprofit organization maintaining industry standards, with details of contests, and career information.
National Institute for Fitness and Sport - Non-profit organization committed to enhancing human health, physical fitness and athletic performance through research, education and service.
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.