“I ended up doing two 11 milers in one week which cranked the miles up, but towards the end of it I was absolutely shattered.
“If you speak to an athlete that’s overtrained, it’s like a weird sort of tiredness.
“You end up with a sort of a 36 or 48-hour bug so after that I thought I’d better go back to 36 or 40 miles because I had a couple of tournaments I wanted to play in and play well.”
O’Sullivan even goes as far as saying his main focus is his health and wellbeing.
“My main focus at my age is good health. I’m 45 and haven’t smoked for nine months because of the running,” he said. “I’m enjoying the benefits of running. My mental health is in a much better place, I don’t smoke and I just feel a lot happier.