Most people associate a charity marathon with months of training ending in a gruelling test of endurance.
But Tommy Refenes has done it from the comfort of his front room in America.
When his sister launched a fundraising page to help their diabetic mum buy an alert dog, Tommy took it upon himself to walk some of the largest maps in gaming to help out.
His efforts ended with a six-hour stint on Grand Theft Auto V (GTA V) as he strolled across Los Santos.
