Umshini wamandla ochungechunge lwe-F, i-F90 umshini wokuqina wesiteshi se-Dual, okungukuthi ukuqeqesha i-Prone Leg Curl kanye ne-Leg Extention emshinini owodwa ofanayo.oklanywe nge-ankle pad elula, elula ukuyilungisa kanye ne-shin pad endaweni ehlezi. Idizayini ye-shin engezansi kwedolo yenza kube lula ukugoqa umlenze ngendlela efanele. Abavivinya umzimba bangakwazi ukubandakanya kalula isisindo sokwengeza ngokucindezela okulula kwe-lever ukwandisa umthwalo womsebenzi.