Greek world-renowned ultra-marathon runner Yannis Kouros is repeating the "Pheidippides' Achievement" course he ran in 2005, covering the approximately 500 kilometers of the Athens-Sparta-Athens route in under 54 hours, and possibly beating his 2005 record time of 53 hours, 43 minutes and 11 seconds.

Kouros set off on the first leg of the ultra-distance race on Tuesday afternoon from the Sanctuary of Pan in Thission, arriving in Ancient Sparta at 4:30 p.m. Wednesday, having covered the distance in 24 hours and 13 minutes.

After a five-minute break for statements to the local press, Kouros set off on the second leg for the return to Athens, where he is expected to arrive back at Thission late Thursday or in the early hours of Friday.

Kouros, who was born in 1956 in Tripolis, is well-known all over the world for his decades of mythical and unbroken world records in ultra-running.

He currently holds more than 115 world records.

Kouros is also an author, poet, composer of songs and instrumental pieces and painter, as well as being acclaimed world-wide as a visionary and supporter and promoter of peace around the globe.