'The World's Toughest Race' is streaming on Amazon Prime now.
Hosted by Bear Grylls, thirty countries compete in a brutal eleven day race across the jungle in Fiji.
Rachael Ryan caught up with Global Endurance athlete Jason Black from 'Team Ireland'.
He told her how it was on of the best experiences of his life and career.
Jason also spoke about how he nearly died after contracting tropical disease in jungle:
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