Matthew Pearce is taking on the St Oswald’s Way 100 miles Ultramarathon, starting on Saturday.
The intimidating event will see him run continuously from Holy Island to Chollerford.
A former Royal Marine, Matthew is doing the challenge in aid of mental-health charity – Combat Stress, which treats veterans suffering from post traumatic stress disorder, depression and anxiety.
Matthew, who helps run Alnwick’s Real Fitness gym, said: “My hope is to raise some money for people who genuinely need our support.”
To sponsor Matthew, visit www.justgiving.com/fundraising/Matt-Runs-100miles