With Britain experiencing its hottest two days of the year so far, thousands of adventurers found an unusual way to cool off – by racing through 100,000 gallons of mud.

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.

Naturally, something like that throws up some glorious pictures. Like this one.

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

Such happiness, such joy!

Presumably, the challenge wasn’t tough enough for this person – so they decided to dress up as Gandalf.

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

It’s been described as “the toughest event on the planet”, and was the brainchild of Will Dean and Guy Livingstone.

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

It regularly takes place in the UK, US, Australia and Canada to test fitness, stamina, mental strength and camaraderie – and there was certainly plenty of the latter on display.

Participants take on the first Tough Mudder of the year at the Culden Faw Estate in Henley-on-Thames
(Joe Giddens/PA)

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

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

It’s definitely one way to cool down on a hot British day.

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