I grew up within an hour's drive of NASA, yet never thought about becoming an astronaut. Still, for the first 42-plus years of my life, walking on the moon seemed more likely than me ever running.
But, well, things change. Getting slimmer became a priority. So I began walking. A lot. Eventually, I started running. And now I've got a shelf full of medals and racing bibs, plus more safety pins than any person could ever possibly need.
I've written about all of this, too.