If you haven't tried running slowly, you should at least once. Just shuffle your way along and breath in the fresh air, noticing the sights, sounds, and smells of the world around you. When you run fast, you develop tunnel vision and miss the world around you.
This morning, I did what I refer to as a "transportation run" into work. The point is just to get from home to work with the least wear and tear possible. I even took some short walk breaks (gasp).
Why am I in such a good mood? My dog slept through the night! I sound like a new father rather than the owner of a 13.5 year old black lab mix.
10.5 miles, 9:33 min/mi, 135 bpm average.