I’ve been thinking about what a PR means to me for the last few days, since I set a personal record for the half marathon at the New York City Half Marathon last Sunday. It isn’t about being faster than other runners. It’s not even about being faster than I’ve been before, as the term suggests. It’s about achieving more than I thought was possible, not just in this race but with running in general, and beginning to believe I really have it in me to run a marathon.