Explain Energy demand for Sedentary or Light Activity Lifestyles?

These people have occupations that do not demand much physical effort, are not required to walk long distances, generally use motor vehicles for transportation, do not exercise or participate in sports regularly, and spend most of their leisure time sitting or standing, with little body displacement (e.g. talking, reading, watching television, listening to the radio, using computers). One example is male/female teachers, office workers (executives, clerks, typists etc.) in urban areas, who only occasionally engage in physically demanding activities during or outside working hours. Another example is housewives living in urban areas, with access to energy saving devices and domestic help to carry out most of the manual chores and other moderate energy activities.