Hundreds of people will gather in Longford town this morning for the FTD Brothers' fundraising marathon.
30-year-old Jordon Adams, from England, is running 33 marathons in 33 days.
Today is Day 16, which involves a marathon starting from The Mall in Longford town at 10am.
Jordon and his brother, Cian, are almost certain to develop frontotemporal dementia, which their mother, Geraldine, died from when she was only 52.
They have family in the Shannonside region, and Jordon says the Longford leg will be very special today: