Hellen Obiri has done just about everything in running.
Obiri, a 33-year-old Kenyan, has gone to three Olympics and won a medal in two of them. She is the only woman to have won world titles in indoor track, outdoor track and cross-country. She has won six of her eight half-marathons and finished on the podium in the others.
There are just a few items left on her checklist.
She would like to win Olympic gold and set a world record. Doing either in the marathon seems like a legitimate possibility, even if she has run the distance in elite competition only once.