Your heart races, your mouth goes dry and you start to sweat.

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Your heart races as you leap forward and plummet toward the bottom.

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Races were being run on Forestry Commission trails next to Loch Morlich in the heart of the Cairngorms National Park.

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At the heart of the competition were ordinary people slogging it out in one of the most grueling races of its kind in the world -- and all for charity.

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