As the world’s fastest blind runner, David Brown of the U.S. Paralympic Team credits his wins to God, his mother’s early advice (“no sitting around”), and his running guide, veteran sprinter Jerome Avery. Tethered to Brown by a string tied to their fingers, Avery guides Brown’s winning races with words and touches.

“It’s all about listening to his cues,” says Brown, who says he could “swing out wide” on 200-meter races where the track curves. “Day in and day out, we’re going over race strategies,” Brown says, “communicating with each other—not only verbal cues, but physical cues.”

In our own life’s race, we’re…