18 days and I'm going to be running an official 5k. I know it's only 3.1 miles. I know I've technically already run that far. But this is the first all-running event I've ever done. What's more, like so many others out there, at this time last year, if you'd told me I'd be running anything...away from a bear, to the store, around a track...I would have told you you were crazy. What a differe…