Common sense dictates there's no such thing. Or does it?

How is this for an industrious undertaking? New York City will be unveiling a wide-sweeping project to reduce pedestrian injuries and fatality including those in school zones.

It doesn't take a genius to conclude that a sedentary lifestyle can be bad for one's health. But a new study published in the American Journal of Epidemiology suggests that the more we sit, the higher the rate of mortality. So a suggestion to school bus drivers: get up and walk around!