When the time finally came for Mike Zimmer to be an NFL head coach, he realized he didn't really know how to do it. So he decided he'd lean as hard as he could on the thing he did know how to do: coach defense.
"When you first get somewhere, you've got to get them to buy in," said Zimmer, who spent 20 years as an NFL position coach or defensive coordinator before becoming coach of the Minnesota Vikings in 2014. "That's why, when I came here, I did everything -- I called the defense, I installed all the defensive stuff, I ran the meetings, all of that, because I wanted them to think that I was an expert at something.