When I started walking for exercise I pulled in a lot of the scenery. As I started trying to walk faster, and over the same old ground, my vision pulled in as I

When I started walking for exercise I pulled in a lot of the scenery. As I started trying to walk faster, and over the same old ground, my vision pulled in as I was concentrating on proprioception. On a leisurely jaunt you don't really have to think about what your legs are doing. When you're hauling ass it begins to matter if your left foot is landing a little different from your right, and how big that heave in the sidewalk is ten feet in front of you.