Without grit and discipline, young athletes won't be successful, said Cary Knox, retired head coach and author of "I Believe," which explores the legacies of Illinois Sports Legends.

We live in a selfish society, and kids who lack discipline are being selfish because they're not good teammates, he said.

He provides examples of grit and discipline on one of his teams. The players struggled for two years, then made a comeback.

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