For example, in 1995, the American College of Sports Medicine and the Centers for Disease Control and Prevention jointly issued national guidelines called Physical Activity and Public Health, which were updated in 2007. The government's recommendation was specific: "Moderate-intensity aerobic physical activity for a minimum of 30 min(utes) on five days each week or vigorous-intensity aerobic physical activity for a minimum of 20 min(utes) on three days each week."
With what we now know, public health guidelines should address both physical activity and physical inactivity, according to public health researchers.