Hmm...if we're talking efficiency as defined per body mechanics, well...I'm not educated enough to really answer that.
My own personal definition of efficiency would be something along the lines that I'd like to be able to train at a distance no greater than a 5k, and be able to run a distance no greater than a 10k with the splits from my 5k. Sounds wonky, but that's supposedly the benifit of running smarter and not harder. Less distance training and faster times, more distance overall, etc.
I'm willing to bet that some of my feelings are spawned from having to teach myself new body mechanics. Guess Im just not a fan of learning curves.
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