Birir is the 1992 Olympic steeplechase champ ahead of favorite Patrick Sang (now Kipchoge's coach).
Asked about her rivalry with Shannon Rowbury, Simpson talks about how having to go up against Sally Kipyego in college made her a lot better.
Kipyego also talked about how she is disappointed with the Kenyan government for not meeting the WADA deadline and feels that they let the athletes down.
He and Mary Keitany will try to defend their titles, while OTC's Sally Kipyego will make her marathon debut. She has been training in Kenya since June and hopes to make the Kenyan marathon squad for Rio.