Nyorai kuenderera mberi kwechikamu chino - Chepkok akaberekerwa muKapkitony mudunhu reKeiyo muKenya Rift Valley Province. Akakunda menduru yesirivha mumakwikwi evana vadiki pa2007 World Cross Country Championships
, akapedza wechipfumbamwe pa2009 World Championships uye wechinomwe pa2009 World Athletics Final. Akawana kukunda kukuru kwemamita zviuru zvishanu pa2010 IAAF Diamond League circuit, achikunda kuBritish Grand Prix.