Mayo woman Anne Jennings joins Ray D'Arcy on RTÉ Radio 1 to discuss Spartathlon, an annual event that is commonly described as the world's most grueling race.

Founded in 1984, the race takes place in Athens every September, challenging 400 competitors from around the world to complete 250 kilometres in 36 hours.

The course runs over rough tracks, crosses vineyards and olive groves, and climbs steep hillsides before taking runners on a 1,200 meter ascent and descent of Mount Parthenio in the dead of night.

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If this feat sounds like the stuff of legend, you wouldn't be far wrong.

The race has ties to Greek mythology as it was inspired by the journey of Pheidippides, an ancient Athenian long-distance runner, who was instructed to run to Sparta to find allies in the war between the Greeks and the Persians.

All in all, he is said to have covered about 240km in two days. Then again, he is also said to have met the God Pan while crossing the mountain.

True or false, the story is so captivating that it has persisted to this day and is the basis behind the modern day marathon.

The real question is: who would dare take on such a challenge?

To find out how Mayo runner Anne Jennings became one of the 400 to take part (for the second time), listen back to the Ray D'Arcy Show on RTÉ Radio 1 above.