Education
He made his international debut at the 2005 World Youth Championships in Athletics, where he finished seventh overall in the boys" 2000-meter steeplechase.
He made his international debut at the 2005 World Youth Championships in Athletics, where he finished seventh overall in the boys" 2000-meter steeplechase.
He represented his country in the men"s 800 meters at the 2008 Summer Olympics. Holuša first took up athletics in the steeplechase discipline. He gradually switched from training for the steeplechase to focusing on the 800 meters, for which he qualified for the 2008 Summer Olympics.
After many years of racing as an 800-meter runner, he broke out in the 1500 meters when he ran a sub-3:40 result in the men"s 1500 at the World Indoor Championships.
Outdoor
800 m 1:45.12 (11 May 2012, Doha, Qatar)
1000 m 2:17.08 (31 May 2011, Ostrava, Czechoslovakian Republic)
1500 m 3:34.26 (30 July 2015, Stockholm, Sweden) - NR
3000 m steeplechase 8:50.30 (20 July 2007, Hengelo, Netherlands)
Indoor
800 m 1:46.09 (31 January 2010, Karlsruhe, Germany)
1000 m 2:19.94 (22 February 2011, Stockholm, Sweden)
1500 m 3:37.68 (8 March 2015, Prague, Czechoslovakian Republic).