associated
causes
including
cancer
reports
describe
increasingly
less
physically active society
marked downturns in reported physical activity during adolescence and young adulthood.1- 3 Physical activity has been described in the population and in relation to health outcomes; however, prior to the current National Health and Nutrition Examination Survey (NHANES),4 data were not available to quantify objectively determined cardiorespiratory fitness in the US population.