"There is something magic inside the marathon because everybody is the same level, " says Sepulchre.

CNN: 220 km Sahara desert run: 'The toughest race on Earth'

That continuity has helped forge a fantastic team spirit and style of play, with everybody knowing their job - and the job of their team-mates - inside-out.

BBC: Lee Dixon's tactical view

Inside this hundred trillion sack of cells that is you, you, Melanie and everybody listening to this...

NPR: Bacteria Outnumber Cells in Human Body