Competitor bio:

David, who describes himself as a failed 800m runner who got old, has completed three ultra-marathons; Gobi in 2008, Ecuador in 2015, and Argentina 2017. However, he has devoted the last year to unusual marathons in odd corners of the world, including Afghanistan, Somaliland, Iraq, Bordeux and the North Pole Marathon where he finished third. Having completed 6 marathons in the last year, David figured the only way to top that seemed to be to do 7 in 7 days...