But the engineer is planning to complete his toughest challenge yet... travelling the entire length of the British Isles using only muscle power.

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Stuart is hoping to become the first-ever athlete to run, row, swim and cycle from the Isles of Scilly to the tip of Shetland.

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And as if the 1,400-mile route wasn't gruelling enough, he is also planning to climb the UK's three highest peaks along the way.

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His challenge has attracted the attention of explorer Sir Ranulph Fiennes, who has agreed to become patron.

His message reads: "It may not be an expedition to the ends of the earth, but the venture brings its own very real challenges."

Stuart said: "It's great to have Sir Ranulph's support because he's a big hero of mine and an inspiration to me.

"I'm keen on distance running, but always just do it for pleasure, so I thought why not give myself a real challenge."

Stuart will set off in a sea kayak from the Isles of Scilly, off the coast of Cornwall, on June 22.

He will then spend four weeks paddling, running, cycling, swimming and finally rowing his way up to Shetland Isles.

The buildings engineer, who works at the Leeds office of AECOM, is hoping to raise at least £10,000 for Avert Aids, Water For Kids and the NSPCC.

* To sponsor Stuart visit: www.britishisleschallenge.co.uk