I n a culture that celebrates speed, measures intensity of workout, and counts life by how many finish lines we cross, walking can feel like the lazy cousin of 'real exercise.' Yet the research behind walking makes a compelling case that our bodies, and our healthy futures, depend on rediscovering this simple, basic movement. And that, in fact, walking is the real exercise humans are designed to do a lot of. As humans, we are not born to run ourselves into the ground; we ar