That said, regular physical activity and physical fitness make important contributions to our health, well being, and maintenance of a healthy body weight.
Americans tend to be relatively inactive. In 2002, one out of four of adult Americans did not participate in any leisure time physical activities in the past month,1 and in 2003, 38 percent of students in grades 9 to 12 viewed television 3 or more hours per day.2
Physical activity is defined as any bodily movement produced by skeletal muscles resulting in
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Behavioral Risk Factor Surveillance System, Surveillance for Certain Health Behaviors Among Selected Local Areas – United States, Behavioral Risk Factor Surveillance System, 2002, Morbidity and Mortality Weekly Report (MMWR), 53, No SS-05. http://www.cdc.gov/brfss/. ↩
Youth Risk Behavior Surveillance System, Youth Risk Behavior Surveillance – United States, 2003 MMWR 53(SS-2):1;29, 2004. http://www.cdc.gov/healthyyouth/yrbs/. Calories burned per hour will be higher for persons who weigh more than 154 lbs (70 kg) and lower for persons who weigh less. Source: Adapted from the 2005 DGAC Report. ↩