Fusion Pro Series Back Extension ndiyokhazikika komanso yosavuta kugwiritsa ntchito yomwe imapereka yankho labwino kwambiri pamaphunziro aulere ammbuyo. Zosintha zosinthika za m'chiuno ndizoyenera kwa ogwiritsa ntchito makulidwe osiyanasiyana. Pulatifomu yopanda phazi yokhala ndi ng'ombe yodzigudubuza imapereka kuima bwino, ndipo ndege ya angled imathandiza wogwiritsa ntchito kuyambitsa minofu yam'mbuyo mogwira mtima.