As amateur marathon runners for nearly 50 years, we were surprised when our sport made headlines recently for an unusual reason.

Last month, The New Yorker published an article on the Michigan dentist Kip Litton, who digitally fabricated an entire marathon and outsmarted computer timing systems. Then Representative Paul D. Ryan, the Republican candidate for vice president, misstated the finish time of his only marathon. He told an interviewer he had run “a 2-hour-and-50-something” marathon when his actual time was 4:01:25. That was roughly equivalent to a golfer’s claiming a 3 handicap when his typical round is 100.

We have rarely encountered tales like Litton’s and Ryan’s. For true distance runners, to lie about time or distance is to lie to ourselves, to diminish the importance of the many sacrifices we make to reach the starting line. Focus and discipline form the core of a runner’s being; they are what make us put on a reflective vest and run six miles into the sleet at 6 on a dark winter morning.