Sporty - Abc Rn

Back in 1978, a couple of thousand runners lined up to compete in the first-ever Melbourne Marathon. Among them, 5 young men - who've run every single one of those marathons ever since. They're now well into their 60s and 70s, and about to do it all over again. So what's compelled them to keep going? And why are more and more ordinary people drawn to competing in endurance events?