Julio Arenas

Career Arenas first competed at the 2011 European Athletics U20 Championships in both the 4 × 400 m and individual 400 m. He didn't advance from the first round in either event.

Arenas placed 6th in the 400 m at the 2013 Spanish Athletics Championships. The following year, he qualified for the 2014 Mediterranean Athletics U23 Championships where he led off the Spanish 4 × 400 m team. His team won the bronze medal in 3:08.46 behind France and Italy. Later that month, he finished 2nd in his heat and 8th overall at the European Team Championships Super League 4 × 400 m. He ended the season 5th at the Spanish U23 Championships and 7th at the 2014 Spanish Athletics Championships. He trained in Fuenlabrada beginning in 2017.