Ultra marathon legend Sam Harvey pushes the limit of what the human body can do.

He's a world record holder for the New Zealand Backyard Ultra, a 677 kilometre race which he finished in 101 hours, and has champion titles in utltra races all over the world.

He's now set his sights on breaking the world record at the Dead Cow Backyard Ultra in Queensland this weekend.

He aims to finish the 800-kilometre race in 120 hours - That's five continuous days and nights of running. All while raising money for charity I Am Hope.

Sam Harvey joined Simon Barnett & James Daniels for Six and a Song.

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