I-HIFEM insimbi yobuhle yemisipha inezibambo ezimbili zokwelapha, ezisekela umsebenzi ozimele novumelanisiwe;Imingcele yokwelapha yazo zombili izibambo ingalungiswa ngokuzimela;ingasetshenziswa abantu ababili ngesikhathi esisodwa, futhi ingafakwa esiswini, isinqe, ingalo engenhla (biceps, triceps), ithanga nezinye izingxenye zodwa noma ngesikhathi esifanayo.