500 wrote:
I think form must make a difference, but I also agree that many of us may think we know what good form is, but may not really...
Probably form is influenced by mobility and strength (i.e. strength of all relevant muscles, without significant imbalances). I suspect that if one can achieve good mobility and well-rounded athletic strength, then the foundations of good form are there.
As far as elite runners with so-so form: It may very well be that the difference between so-so and truly good form is only a marginal increment... say (as a random example) the difference between 2:06 and 2:05 for a near WR pace marathon. At the limit, I would think form has to account for something.
It all starts with the feet. Everything else should follow on from that. To run efficiently we need to develop and maintain a whiplash motion (for want of a better description) with the feet, to achieve maximum elastic recoil. This elastic recoil is present in all of the skeletal muscles and it's free energy, a natural spring.
But trying to discuss this on a website where so many posters want to talk about stride rate or 'landing under the center of gravity' seems to be a waste of time.