Skinningrove Coastguards deputy station officer Paul Waugh, will run from Whitby to Saltburn on Saturday, to raise money for Skelton Primary School.
Earlier this year, Mr Waugh completed a coast-to-coast charity bike ride in aid of the Butterwick Hospice.
He was inspired to complete the challenge after meeting the family of Johnathan Baker, from Stockton, who died from a brain tumour in April.
There is a competition to guess how long it will take Mr Waugh to complete Saturday's 20-mile run, with a prize of a trip to the main operations centre of the Bridlington coastguard.
For details, or to sponsor Mr Waught, call (01287) 650689.
* The school will hold a summer fair next Wednesday, starting at 3pm.
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