Competitors take part in the Tough Mudder Scotland at Drumlanrig Castle on June 21, 2015 in Dumfries and Galloway, Scotland.

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Competitors take part in the Tough Mudder Scotland at Drumlanrig Castle on June 21, 2015 in Dumfries and Galloway, Scotland. Tough Mudder is a 10-12 mile military-style obstacle course created by two British Harvard Business School Graduates. It encourages teamwork and tests mental as well as physical strength.

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Photo credit: © Sam Kovak / Alamy / Afripics
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