The 59-year-old was at a local gym when the incident occurred, describing it to the BBC.
He told BBC Sport: "I went to a spin class and don't remember too much more. I had a big cardiac arrest, unfortunately.
"Lots of people looked after me and did some great things in the gym, then the ambulance looked after me and I ended up in hospital for a good few days.
"I've been brilliant since and the heart is in good shape. I've got a little thing, an ICD (implantable cardioverter defibrillator) fitted that I hope will keep me going for another 20 years.
"It was probably more terrifying for my wife watching, but my view is I'm one of those lads who looks forward and I've been very, very lucky.
"I was in the right place to have it and perhaps it just wasn't my time."