IT is known as probably the toughest event on the planet, but that failed to deter thousands of Scots from taking on Tough Mudder's 12-mile assault course.

Some 16,000 competitors descended on Dalkeith Park over the weekend to push their mental and physical limits in the gruelling SAS-designed challenge.

The the endurance test pushes runners to their mental and physical limits as they sprint, duck, crawl, swim and leap their way along a brutal obstacle course.

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Unlike traditional running events, teamwork is the name of the game. Contestants are expected to help their fellow "mudders" run through electric wires, climb walls and plunge into ice-cold pools.

The challenge, launched in 2010, is now held in more than 60 countries worldwide.