 Complete the following phrase:  Cerovac took up athletics for the first time at the age of 15. He subsequently began training with AK Mladost Užice from Užice in Serbia, which is over 1,300 feet above sea level. He ran his first major international race at the 2010 European Cross Country Championships, where he ran in the junior race and placed second overall. In 2011, Cerovac enrolled in the Faculty of Physical Education in Sarajevo, Bosnia and Herzegovina. He continued training athletics simultaneously with studying under his coach Miloš Mitrić, a former Villanova distance runner. At the 