Martin Brady is the world record holder for lowest resting heart rate. His bpm is 27. What sport does he play?

I found the details of his world record here: http://www.guinessworldrecords.com/Search/Details/Lowestheartrate/108662.htm





But so far I haven't found any information as to what physical activity he partakes in professionally...does anyone know what he plays? Please cite a source if you answer.|||I would guess scuba diving would be a good choice.