It's an old cliché, but the secret is 'there is no secret.' It's easy to package articles and say, 'The 8 Best Ways to Your Best 10k,' or 'The 10 Secrets to the Marathon.' But really there's no 8 or 10, it's really hundreds. It's consistency, not just day-in, day-out, but week, month and year-in, year-out consistency and planned rest. That is ultimately the 'secret.'