John Snow wrote:
No. A half marathon is a race. Putting an article in front of a distance makes it an event rather than just that distance. There's a difference between running a 5k and running 5 kilometers. If my friend were to ask me if I wanted to run a half marathon I would assume he meant run a race with him, not go for a 13.1 mile run.
This. I run over 13.1 miles twice a week but I've only run 1 half marathon