Hellen Obiri | Photo by Kevin Morris / @kevmofoto By Chris Chavez The beauty of the Boston Marathon is its unpredictability year over year. As we’ve learned, Boston is not a race that can be gamed or neatly categorized. It is, instead, a kind of athletic improvisation—where preparation collides with unpredictability and the outcome belongs as much to the moment as it does to the plan. Last year, Ethiopia’s Sisay Lemma and Kenya’s Hellen Obiri won in dominant yet contrasting fashion.