Ikirangantego cya Discovery-P Ikomeza Isanduku Yimbaraga ikomeza pectoralis yo hepfo binyuze mumigambi yo guhuza imbere mugihe ikora pectoralis major, triceps, na deltoid imbere. Inzira nziza ya biomehanike ituma imyitozo irushaho kuba nziza kandi ikora neza. Imbaraga zingana ziyongera, inkunga yo guhugura ukuboko kumwe, byombi tubikesha imyitozo itandukanye itangwa nintwaro yigenga.