A week or so ago the Tough Guy challenge race was held in England.  This race, over a tortuous 13km obstacle course, has been run since 1986.  This year it attracted some 5,000 competitors.  They run over the course, through manure, ice-cold water, sewer pipes and even more mud, as well as flames while dodging smoke bombs, barbed wire and electrical charges.

The course is so taxing that, to take part, runners are required to sign a disclaimer which reads: "It’s my own bloody fault for being here."

Do you reckon this is tough though?