Shakespeare may have framed it best when he said, “Be not afraid of greatness. Some are born great, some achieve greatness, and others have greatness thrust upon them.” Is the nature/nurture argument the same with mental toughness? Are runners born mentally tough or do they “have it thrust upon them”–and if so, how? First, a disclosure: Our family crest is a yellow chicken with a French inscription “Espere Mieux”. If mental toughness runs in our family it appears it may have skipped the generation when our family crest was inscribed!