A runaway success

Many swear by running, saying it’s great for the health, as they push their (sometimes middle-aged) bodies to new limits of endurance, entering marathons and 10k races here and there.
I’m not sure just what it is that’s compelling so many people to run. Is it just a new fad that will burn itself out? Are all these people running away from something or are they all running towards a bright new future for Ireland?