 On 31 December 2011, Denniss began a quest to run around the world.He set a new world record and while doing so raised money for Oxfam.Dennis completed the 26,232 km journey on 13 September 2013, becoming just the second person to successfully complete a fully documented world run according to the rules defined by the sport's international governing body, the World Runners Association, in the process setting a new world record of 622 days for the Fastest Circumnavigation of the Earth on Foot.