At training camps around the NFL, the whistle is a powerful instrument, keeping practice on time and orderly. But it’s not the whistle that builds culture. It’s not the whistle that teaches skills. It’s not even the coach himself, necessarily.

It’s the repetition of targeted drills.

Of course, there are an infinite number of football drills. But the right drill can instill toughness alongside technique. The right drill can create confidence through preparation. The right drill can help a team win games and, ultimately, the Super Bowl.

So we asked a dozen NFL head coaches for their favorite drill — and we also asked them to explain why it’s…

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