Andy Cottrell only started running when rugby, as he says, became too much for his body.
It has now become an obsession.
Inspired to take part in 12 marathons across a year, he quickly came across other runners who made even that incredible achievement look minuscule.
The Northampton Road Runner, better known as Sharky, soon had his sights set on 50 marathons and then on becoming a member of the exclusive 100 Marathon Club.
These days his mind has turned to the 300 mark - this is Sharky's running tale...
The music in this podcast is:
"Fearless First" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License