Tom didn't make his team work harder. He changed his recruiting philosophy, focusing on speedier defensive players and targeting faraway football hotbeds like New Jersey.
So...were those guys born fast, or did they run until they were the fastest? Because speed can be practiced and coached, although it rarely is in football, and universally is in track.
I know of two players who were on the Huskers team who sped up because they practiced and conditioned to get faster. One tactic being to lengthen their stride.
I apologize for sounding like a broken record, but hard work trumps all in almost every human endeavor. That dictum doesn't magically disappear because of chalk lines drawn on a playing field. Paul Hornung said that it was harder to go through a Green Bay practice than an NFL game, and that is what made them a great team.
But hey, 5-7, so "Jimmies and Joes", Am I right?