Kammala wannan jumla: An haifi Masai a ƙauyen Chepkoya, Gundumar Mount Elgon. Ita ce ta uku da aka haifa a cikin iyali na hudu. Ta yi gasa a lokacin da take makarantar sakandare yayin da take makarantar sakandare ta Kibuk. Ta kammala karatunta a shekarar 1988. Ta shiga Ma'aikatar Fursunoni ta Kenya a cikin 1990, wanda aka sani don ɗaukar ƙwararrun 'yan wasa da yawa. Masai, duk da haka, ba ta cimma komai ba har zuwa 1999, lokacin da ta zama zakara ta tseren tseren ƙasa, tana da shekaru 32. Saboda haka, ta soma horar da kanta sosai. Ta lashe gasar Lotto Cross Cup Brussels a shekara ta 2001 kuma ta ci gaba da daukar tagulla a cikin gajeren tseren a gasar
Gasar tsere ta duniya a wannan shekarar. Ta inganta wannan a shekara mai zuwa, ta dauki zinare a gasar zakarun duniya ta 2002 IAAF.