The man who is aiming to run 30 marathons in 30 days for charity will finish his 19th in Hemel Hempstead today.
Matthew Loddy, 47, is due to enter the town through Marlowes between 1.45pm and 2.15pm, and he wants people to cheer him on to the finish line at the bandstand.
Matthew, of Watford Road, Kings Langley, is fundraising for the Teenage Cancer Trust by running between all of its UK centres.
He said: “I have met some amazing patients and the amazing people who look after them and it has been an amazing journey so far. I can stop at any time I want. These people being treated can’t.”
Donate to him at www.frameworkfoundation.co.uk or text RUN30 to 70300 to donate £3.