Gary Hanson wearing the watch. See SWNS story SWLEwatch. A retired retail manager discovered he had a life-changing heart condition after he tried on his friends smartwatch for the first time. Gary Hanson, 60, believed he had atrial fibrillation (AF) a dangerous heart rhythm condition and a major cause of stroke. And for at least two years, he jokingly putting his anxiety and irregular heart rhythms down to supporting Leeds United. But Gary's life changed forever during a chance meeting with a friend.