Increasing the proportion of adults in the United States (U.S.) who engage in physical activity is a national priority. Only 29% met the aerobic guideline, 3% met the muscle strengthening guideline only, and 21% met the guidelines for both aerobic and muscle-strengthening activity. Individually oriented physical activity interventions can be intensive and have large effects; however, changes may be temporary unless supportive environments and health-promoting policies are in place. A variety of strategies are required to get and keep people physically active.
ACSM Health and Fitness Journal, vol. 22, no. 4, 29-32.