Czech national record holder in long jump. With personal best of 8.31 m. Silver medalist from European Indoor Championships 2015 in Prague and amateur photographer.
Raised in Starovičky, in the south-eastern Břeclav District, Juška made his international debut for the Czech Republic at the 2012 World Junior Championships in Athletics. Despite having set a personal best of 7.71 m (25 ft 3 1⁄2 in) in June, he was far off this form at the competition and ranked 24th in qualifying with a best jump of 7.11 m (23 ft 3 3⁄4 in).
In 2013 he won the Czech under-23 titles in both the long jump and triple jump. He followed this up with his first senior national title at the 2014 Czech Indoor Championships. Outdoors, he was the long jump winner at the Josef Odložil Memorial in Prague (the country's foremost track meet) with a personal best mark of 7.94 m (26 ft 1⁄2 in). He had his senior international debut that year at the 2014 European Team Championships, clearing 7.76 m (25 ft 5 1⁄2 in) to take eighth place overall. He gained a wild card selection for the 2014 European Athletics Championships, but a torn abdominal muscle suffered at the national championships that year meant he was not fit to compete.