Thousands of people are expected to turn out for the second day of the Tough Mudder in Dumfries and Galloway.
The event, at Drumlanrig Castle, is billed as the toughest endurance challenge is the world. Participants jump into pits of nettles, walk through fire, and be shocked by electricity on the twelve-mile course.
It's the first time the Tough Mudder has come to Scotland.
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