Tuhia he tomokanga mo tenei waahanga - I angitu a Rengeruk i te tau 2013, i te wikitoria i te whakataetae whakamatautau taiohi o Kenya i mua i te whiu i a Berhan Demiesa o Etiopia ki te tango i te taitara 3000 mita i te 2013 World Youth Championships in Athletics. I te tau e whai ake nei, i noho ia ki te tuarima i te whakataetae rangatahi i te Whakataetae o te Whenua o Awherika
, te tohatoha i te koura a te kapa. I whakawhiwhia e ia he wikitoria i nga whakamatautau rangatahi o Kenya me te 3000 m pai o te 8:53.41 meneti i tana timatanga IAAF Diamond League i Doha. I te 2014 World Junior Championships in Athletics, heoi, i kaha atu ia i te kaitakaro o Amerika a Mary Cain, ka waiho a Rengeruk me te mētara hiriwa.