Lincoln strongman prepares for "toughest challenge".
Dave Johnson is looking to raise money for good causes along with 3 others.
A Lincoln strong man says his latest fundraising effort will be his toughest yet.
Dave Johnson's teaming up with 3 others to carry 150kgs a mile each.
It's the equivalent of 81 competition runs!
All the cash raised will go towards the City's Salvation Army and Gainsborough mental health charity The Bearded Fishermen.