Dan Campbell has a difficult, if not impossible, job as coach of the Detroit Lions .

He has to get a bunch of highly competitive, elite athletes ready to play a grueling, violent, dangerous game while they keep their emotions in check as they endure trash talk, cheap shots and taunting by opposing fans.

Campbell knows it’s his responsibility to make sure his players walk the razor’s edge of being effectively aggressive while also not engaging in actions that hurt the team.

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