Kammala jumlar da ke gaba: Kirwa ya wakilci kasarsa ta Finland a gasar Olympics ta 2008 a Beijing, inda ya yi takara a gasar
tseren marathon na maza. Ya yi nasarar kammala tseren a matsayi na goma sha huɗu da dakika ashirin da biyu a bayan ɗan Spain José Manuel Martínez, a waje da mafi kyawun lokacinsa na 2: 14:22.