American Council on Exercise (ACE)
Nonprofit organization which promotes active lifestyles by setting certification and education standards for fitness instructors. Site includes a health club finder and exercise tips and information.
Recreational movement to music for people over 60 and disabled people of all ages.
Project Fit America
Project Fit America is a large national agency that works at the grassroots level with schools and front line educators to create new opportunities for kids to be active, fit ,and healthy. They work with communities to bring in funding, equipment, teacher training, curriculum, and the resources schools need to actually get kids fit and foster a love of movement.