Ranulph Fiennes digs in to complete ultra marathon in desert

The coach of adventurer Ranulph Fiennes has revealed the 71-year-old explorer is overtaking people a quarter of his age during the Marathon des Sables.

Fiennes is facing temperatures of more than 50C and endless sand dunes in the challenge, dubbed the toughest footrace on Earth.

He hopes to raise €1.35m for UK charity Marie Curie.