One of the best ways to stay in shape and give the planet a break from carbon emissions is by walking. In my old neighborhood, I walked and biked everywhere with my dog, since nearly everything was easily accessible, from the farmers' market to the public library to my favorite cafe. In my new neighborhood, there's a pretty major hill to contend with (actually the steepest street in the East Bay), as well as about a 3/4-mile walk each way to just get to the cafe or grocery store.