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When we grow up, opportunities to play in the mud become few and far between, but 500 people will do just that in Dunedin this Sunday.
Organisers of the Mud Sweat and Tears Challenge are bringing the "commando obstacle course" to the city for the first time after three successful years in Christchurch.
The 5km route included a waterslide, climbing frame, maze and plenty of mud.
Event director Vaughan Utteridge described it as "a cross between a cross-country run and a commando obstacle course".
Thermals were recommended, as was taping running shoes to feet to avoid losing them in the mud. A "wash down" area was provided. The focus was on fun, with dressing-up encouraged.
"We wanted something that everybody can do, not just the super fit," he said.
The challenge started in Christchurch in 2010, inspired by similar events run in New Zealand and overseas.
It was hoped the challenge would be an annual fixture.
"When else do adults have the chance to go and play in the mud like their kids?"