Things weren't looking good for the Dixie High Flyers of St. George, Utah.

Midway through the season, the boys' football team had lost four of six games and, facing the best team in the region, was expected to lose once again.

Then, over the span of one weekend, a miraculous change occurred within the team-and the Flyers started winning.

Comprised of average-sized boys with good but not great football skills, the team's astonishing transformation had little to do with bulking up, practicing harder, or suddenly passing better or running faster. Instead, it had everything to do with...