The cure: Look up!
Good posture for walking allows you to breathe well and provides a long body line to prevent problems with your back, neck, and shoulders.
Chin up when walking - it should be parallel to the ground.
Your eyes should focus on the street or track 10 - 20 feet ahead. You'll avoid doggy doo-doo, find cracks in the sidewalk, spot potential muggers, and still collect the occasional coin.