Thousands of adventurers found an unusual way to cool off this weekend – by racing through 100,000 gallons of mud.

Participants take part in a Tough Mudder event race at Drumlanrig Castle, Thornhill in Scotland(Robert Perry/PA)

The annual Tough Mudder event at Drumlanrig Castle and Country Estate in Thornhill, Dumfriesshire, saw participants run through ice cold water and navigate around 20 obstacles in a course designed by British special forces.

Described by organisers as “the toughest event on the planet”, the extreme endurance challenge was the brainchild of Will Dean and Guy Livingstone and regularly takes place in the UK, US, Australia and Canada to test fitness, stamina, mental strength and camaraderie.

A man takes part in a Tough Mudder event(Robert Perry/PA)

While Tough Mudder participants climbed 12ft walls and crossed muddy trenches, other runners found a more traditional way to unwind with 5k and 10k charity races held in Glasgow and Dundee over the weekend.

Held on Father’s Day, Roy Hann was cheered across the finish line of the Race for Life Dundee by his 13 children.

Participants take part in a Tough Mudder event(Robert Perry/PA)

He said: “I can think of no better way to celebrate Father’s Day.

“So often in my job as a nurse practitioner I try to help patients who have cancer. I’ve seen first hand how devastating the disease can be. That’s why I’m determined to do everything I can to help fund research to help beat cancer sooner.”