Have you ever found yourself wondering, Why do so many people look for mostly flat races? Why aren’t there any really hilly races? (Well, there was this year’s Cause + Event’s “Hillaceous Half Marathon,” recapped by Annette Vaughn here.) That must have been what I was thinking when I signed up for the Volcano Race PDX using the Run Oregon comp entry. In fact, I must have been longing for hills so much that I signed…