I made a discovery with which led to a giant improvement.
Background: I've done 3 Goofys, 10 marathons, 1 52 mile ultra, and too many 5 and 10ks to count. I been running on and off for 30 years and consistently for 15 years. My real point here is I'm not a rookie; I've been doing this for a while.
What led me to the discovery: It started with the form QOTD. My answer was that I don't keep my arms up high enough (which is what you do when you walk). Then
@CheapRunnerMike posted a picture of himself finishing the 2015 marathon. I noticed his 'rear' foot is up so high, it's hidden behind his knee. By comparison, in almost all my race photos, my feet are never more than a few inches off the ground. It seems like in most, they are both on the ground. Not sure how this is even possible!
The discovery: After looking at more of my race photos and comparing them with 'real' runners and doing a little bit of googling, I have come to the conclusion that what I call running is really just fast walking. In walking, you basically lift 1 leg forward and 'pole-vault' over your planted leg. In running, you're storing energy in your planted leg and 'pogo-sticking' off of it.
The improvement: I made an effort to get my feet off the ground. Lifting my knee a little higher in the front, and trying to make more of a 'butt-kick' motion in the back. With just those simple changes, I am about a minute per mile faster at the same effort! Checking my log, the last 3 Mondays I've done 7 miles at 9:40, 10:20, and 10:26 per mile. Today i did 8:57!
Has anyone else made a small change that led to big improvements? For those of you more into the science of running, is my analysis correct? Is this a know problem?