In 490 BCE Pheidippides ran for 36 hours straight from Athens to Sparta to seek help in defending Athens from a Persian invasion He was hailed as a hero & his run stands enduringly as one of greatest physical accomplishments in history Dean Karnazes honours this achievement & his own Greek heritage by attempting this ancient journey in modern times His account of running the gruelling Spartathlon fuelled only by the figs olives & meats available to Pheidippides will captivate even the most sedentary readers