 Kọ itẹsiwaju fun paragirafi yii - Ni 2005 European Athletics Junior Championships ni Kaunas Lithuania Horna pari ni ibi 8th ti idije 800m. Wọn yọ ọ kúrò nínú ìdíje àgbáyé 2006 World Junior Championships in Athletics : ni Beijing, ati ni igba akọkọ ti 2009 European Athletics Junior Championships ni Kaunas, ni awọn akoko mejeeji lori ijinna 800m. Ni ọdun 2009 o gba ami ẹyẹ orilẹ-ede akọkọ rẹ lakoko Awọn Ajumọṣe Ajumọṣe Ajumọṣe ti Ilu Jamani. Ó gba àmì ẹyẹ fàdákà ní ìdíje ìdíje ìdíje Ni ọdun 2013 Horna gba ami ẹyẹ lori ijinna 1500m ni German Indoor Athletics Championships, o si daabobo ami ẹyẹ rẹ ni ọdun 2014. 