In September 2014, 349 runners set off to run the 246 kilometres from Athens to Sparta. The goal is to complete the Spartathlon within 36 hours, combatting the heat of the Greek sun, the chill of the mountains at night and the brutal cut-offs.
And behind this race lies the ancient history of Pheidippides and the Battle of Marathon in 490 BC.
The Road to Sparta tracks four of the runners, including America's best-known ultra runner Dean Karnazes, as they battle the merciless route: do they have the physical and mental strength to reach Sparta?
The Road to Sparta will be released in September 2015
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