 Rambai muchinyora ndima iyi - Achiri muduku, Chepkirui akakwikwidza mumakwikwi emakore. Akakunda Yuriko Kobayashi pamusoro pe1500 m pa2005 World Youth Championships muAthletics kuti atore menduru yake yekutanga yegoridhe yepasi rose. Nguva yake yokupedza mumaminitsi 4:12.29 yakanga iri rekodhi yemakwikwi. Akadzoka kuzodzivirira zita rake makore maviri gare gare, asi akapedzisira ave menduru yebronze pachiitiko cha2007. Akakundikana kuvandudza pa2008 World Junior Championships muAthletics uye haana kupfuura kupisa. Akasiya mutambo pashure pegore iroro. 