Phillip Cox served in the Royal Army Medical Corps for 22 years.
Now aged 66 he has embarked on a fundraising mission to raise money for a charity who helps serving members of the RAMC and their families who may be experiencing hard times.
Phillip, who is from Conisbrough, said: “I wanted to walk the Land’s End to John O’Groats route but my doctor advised me against it due to my health.
“So I’m bringing the challenge to Doncaster and walking around the town until I hit 1206 miles.
“I have already done 346 miles and I reckon I will be done by about September.”
Phillip heads out most days on a morning walk - he often visits Sandall Beat Wood, Armthorpe and Cantley.
This is not Phillips first fundraising effort; he cycled 4200 miles around the UK in 100 days and ran the BUPA Great North Run.
But due to his health he has decided that this will be his last large physical challenge.
“I want to say thank you to everyone who has donated so far,” he said.
“It’s nice to have a reason to go out every day and to have something to focus on.
“I have PTSD and due to cutbacks in services I have been left to my own devices.”
He has so far managed to raise £1470 - you can donate here if you wish to do so.