involve prolonged sitting or lying down and a lack of whole-body movement, e.g.
sitting at a computer. They are not the same as physical inactivity, which is a lack of
physical activity in everyday life.
Fortunately, regular physical activity, independent of body
fatness, can decrease the risk of developing certain cancers
( 23). However, nearly half of adults in the United States do
not meet the recommended guidelines for aerobic physical
activity ( 25) (see sidebar on Physical Activity Guidelines, p.
19). Moreover, sedentary behavior, independent of body
mass and periodic physical activity, can increase the risk of
developing certain types of cancer ( 24).