 Muna May 2012, Arenas akakunda makiromita 10 evakadzi chiitiko chechidiki pa2012 IAAF World Race Walking Cup muSaransk, Russia. Muna Chikunguru 2012, Arenas akahwina menduru yebronze mumakwikwi emakwikwi e10km mumakwikwi e2012 World Junior Championships muAtletics nenguva ye45:44.46. Arenas akaisa 32nd mumakwikwi emakiromita makumi maviri mumakwikwi eOlympics yegore ra2012nenguva ye1:33:21. Akapinda zvakare mu32nd pa2016 Summer Olympics, aine nguva ye1:35:40; Akaenderera mberi kunzvimbo yechipiri mu2020 Summer Olympics, aine nguva ye1:29:37. 