Yamazaki Inc.
Murugo / Ubucuruzi bushobora guhindurwa Dumbbell, Kettlebell ishobora guhindurwa, Barbell, Intebe
PowerBlock, Inc. yashinzwe mu 1991 n’abashinzwe ibikoresho by’imyitozo ngororamubiri yihariye babaye inshuti mu gihe bategura ibikoresho by’amasosiyete menshi arimo Parabody na Cybex. Mugihe bashakisha ibikenewe mubikorwa byimyitozo ngororamubiri, bakwegereye ubwinshi bwa dumbbell bazahura nububiko bwihariye bwimyitozo basuye. Hagomba kubaho uburyo bwiza bwo guha abakunzi ba fitness ibyiza byo gukora uburemere bwamaboko nta mwanya hamwe nimbogamizi za rack zishaje na dumbbells. Hano niho igitekerezo cya PowerBlock cyavutse. Nyuma yimyaka ibiri yikizamini kinini, PowerBlock yatangiye kugurisha "dumbbell yatoranijwe". Kuva icyo gihe, PowerBlock yakomeje kuba umuyobozi mubikorwa byimyitozo ngororamubiri mugihe duhora duharanira kwikorera ubwacu dushakisha ibyiza.
