I just returned from a 6-mile run around Central Park which was more exhausting than it normally would be all because of body awareness. The entire run, it was: "shoulders relaxed, don't overstride, chin up!" When I rounded a turn and saw my shadow running alongside me, I told it to lean forward a little more (I have a tendency to lean backward and that's not using gravity to my greatest advantage).
I was also thinking a lot about elasticity and energy return. Every step is energy hitting the ground. Don't give all that energy away to the earth take what you can back in the form of forward propulsion (be elastic) but do not bounce! After all, you want to move forward, not upward. Elasticity is also important for injury prevention. Core strength, center of gravity, what you do with your arms (don't let them cross the body; keep them pumping at your side) and cadence (kind of goes with don't overstride). Running is not simply put one foot in front of the other, that's for sure.
Next up is a trip to the gym. I'll be doing more strength, core and balance exercises. Then a visit to the chiropractor. Busy day!