Originally I was going to put this under "Assorted Links" but I decided it deserved its own spotlight. Here is one very good excerpt of many:
During the drive phase, Bolt and the rest of the runners are all leaning forward at an unsustainable tilt, their torsos out ahead of where their feet impact the ground. They are basically in the act of falling down, face-first, but their legs, racing against gravity, are preventing that from happening, propelling them forward so hard and so fast that their bodies, instead of face-planting, begin to slowly rise up into a full upright position. Sprinters often describe this phase, when everything happens correctly, as being analogous to liftoff in an airplane.
Here is another good bit:
His top speed is such a spectacle, so phenomenal, so searing that many who witness this race, who see Bolt cross the line in 9.69 seconds, breaking his own three-month-old world record by three hundredths of a second, don't notice, until they see the replay, what is perhaps the most salient and frightening thing about his performance: Approximately eighty meters into the race, twenty meters from the finish line, Bolt stops trying.