TL;DR: Ankle Angle
Like this (it's a subtle ankle-angle change):

Not abdominal (or abominable), like this):

(if he runs in November '28 he'll fall on his face!)
There is much to be gained during medium paced and long-distance runs from tilting forward to use the pull of gravity and work less.
Like a cartoon character who persists forward while on the verge of falling while keeping his body straight (but less exaggerated) your center of gravity is shifted ahead, but not from bending at your middle. Make a very slight forward angle at your ankles.
Magically, by allowing gravity to pull you forward, your running will no longer be solely based on your leg strength. Your tilt will act as a gas pedal where the more you tilt the faster you go (I dont recommend flooring it). As you lean forward use your abs to keep your body straight - yet somehow still relax, gaze forward and use your glutes while running silently and floating. Trust me, it will all come together. One thing at a time.
Think about it this way: don't think too hard about it. Just tilt forward at ankles like MJ (not at windmills though) but then start to run.
It's very much a self-fulfilling prophecy thing. In the words of Misha (our former running Guru): "I like to think of runners as optimists, a tilting pessimist would fall on their face."
Head Bob #1 (bubbles), Bended Knee #2 (bubbles), Short Strides #3 (bubbles), Arm Swing #4 (bubbles), Quiet Feet #6 (bubbles), Ground Contact #7 (bubbles), Passive Stride Recovery #12 (bubbles), Run Tall #14 (bubbles).
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