Originally Posted by BMC9670
Yes. Top runners have refined technique as well on top of a ton of natural ability - mostly having to do with keeping everything in a straight line (ie - no wasted movement) and staying relaxed. The kinetic chain is also involved - the mechanics of stride and use of the arms, etc.
You're right about being quick. A modern world-class 800m is considered a long sprint. These guys are fast and running 8 consecutive 13 second 100s to cover 800m. They can certainly run a single 100 somewhere in the mid to high 10 seconds. Even at his older age, if this guy is still in shape, he probably makes running look effortless.
He works for a shipping company now and stays active , off a very nice stop watch ran and unofficial 4.3 , incredible even if I was off a bit .