You'll remember from the previous post that "correct running form asks only that runners eliminate the variables, and reinforce the invariables." In running, while foot-to-ground contact is a given, does nature favor one manner of landing and loading over another? Let's find out.

In as many weeks, this five-part blog post series on "Running Form: Simplified" will carefully sift through the particulars of running so that -- like our most ancient forebears or our youngest children -- ultimately, we can just run.

I myself have benefitted from high levels of conditioning overriding fledgling skills, but I know with certainty that unless correct running form is learned, eventually the undue strains of sloppiness will overrun even the greatest muscular conditioning.

With the New York City Marathon just around the corner (we hope), many athletes, workout enthusiasts and fitness newbies are looking to the streets or the treadmill for a spot of cardio. There's no doubt that when done properly, running can be great for heart, body and mind.

Success -- to run farther, run faster, and run with less chance of injury, and otherwise savor the joy of running -- asks only for attention, practice, and patience.

How old were you when you learned to run? Do you even remember learning to run? Are you "good" at it?