If exercise and regular physical activity benefit the body, a sedentary lifestyle does the opposite, increasing the chances of becoming overweight and developing a number of chronic diseases. Despite all the good things going for it, only about 30 percent of adult Americans report they get regular physical activity during their leisure time—and about 40 percent of Americans say they get no leisure-time physical activity at all.
via The Benefits of Physical Activity | The Nutrition Source | Harvard School of Public Health.