Even people who only do one exercise session a week can prove their mettle by taking part in military boot camps, pole dancing lessons or cage fighting keep fit.

BBC: From marathons to mud running

It shows Mr Lerwell and Mr Lilley - members of the Swansea Predators cage fighting team from Mount Pleasant - dressed in women's clothing celebrating a stag night in Swansea city centre on 30 August this year.

BBC: Cage fighters' stag night web hit

But the team's performance in that game, when it resorted to tactics more usually seen in cage fighting than on a soccer field in a fruitless attempt to stop Spain, has led some to call for a return to traditional Dutch principles.

WSJ: Like for Like Among Old Rivals