“I’ve done endurance events before, but nothing like this,” says Bell, who is doing the challenge with five friends. “The running itself will of course be a challenge but having any sleep confined to the few hours I can grab on planes between locations adds a whole new element. And I like my sleep.

“We are doing this in order to raise money for charity. We have selected: KEEN London (UK) and The John Maclean Foundation (Australia). These charities provide access to sport for disabled children as well as helping them lead normal lives. This adventure is self-funded and all donations go directly to the charities.”