But he returned to his old last week to take part in the Chichester Priory 10k event, despite having been, in his own words, plagued by injury over the past year.
Colin, pictured, also wrote about his experiences in a first person piece published in the current edition of the paper.
He said: “It was more than a year ago – probably nearer two – when I started writing in the Observer about my efforts to get fit. It was all geared towards completing a competitive 10k.
“Lots of people doubted I’d ever make it to the start line, let alone the finishing line. In fact, when I left the paper three weeks ago to edit daily newspapers in Essex, one of my leaving ‘presents’ was an entry form for the Colchester 10k as my colleagues were tired of hearing me say ‘one day I’ll enter a race…’”
Colin completed the race in one hour and five minutes to be greeted at the finish line by Observer reporter Chris Shimwell, who had finished earlier and looked “as fresh as a daisy.”
Added Colin: “To everyone at the Observer newsroom – I told you I’d do it .. eventually!”
A video of Colin taking part in the race can be seen below.