We all know the sports adage that "You can't teach speed," and it is a characteristic that college football coaches are looking for more and more these days as the game spreads out and speeds up each season.

Speed is also relative - football speed, track speed, with or without pads, when the lights are on and the stage is big, etc.

All that said, the folks at NFL.com are doing a series of "17 for '17" content pieces and they tackled a list of the fastest returning players in college football.

Here is their list and what they said about each speedster.