Barbell wani yanki ne na kayan aikin motsa jiki da ake amfani da shi a cikin horar da nauyi, ginin jiki, ɗaga nauyi da ƙarfin ƙarfi, wanda ya ƙunshi doguwar mashaya, yawanci tare da ma'aunin nauyi a kowane ƙarshen. Barbells yana da tsayi daga hudu 4 feet (1.2 m) zuwa sama datakwas 8 feet (2.4 m), kodayake sanduna sun fi 2.2 metres (7.2 ft) masu amfani da wutar lantarki ne ke amfani da su kuma ba gama gari bane. Babban ɓangaren mashaya ya bambanta a diamita daga milimitaashirindabiyar 25 (0.98 a) zuwa milimitahamsin 50 (1.96 a) (misali, Apollon's Axle), kuma galibi an zana shi tare da ƙirar crosshatch mai ƙyalli don taimakawa masu ɗagawa su riƙe madaidaiciyar riko. Faranti masu nauyi suna zamewa saman sassan mashaya don ƙaruwa ko rage jimlar nauyin da ake so. Ana amfani da ƙuƙwalwa don hana faranti yin motsi waje ba daidai ba don mai ɗagawa bai sami ƙarfin da ba daidai ba.