FF Series Back Extension yolimba komanso yosavuta kugwiritsa ntchito imapatsa ogwiritsa ntchito maziko olimba ophunzitsira mphamvu. Ma hip pad osinthika ndi zogwirira zokhazikika zimapatsa ogwiritsa ntchito chitonthozo chowonjezereka komanso zimathandiza kuti magwiridwe antchito awo akhale omasuka.
Ma pad osavuta okhala ndi ma hip awiri okhala ndi ma pad okhuthala kwambiri komanso malo ogwirira ntchito bwino kuti atsimikizire kuti agwira ntchito bwino komanso kuti azikhala bwino.
Ma roller a thovu okhuthala kwambiri komanso nsanja yayikulu ya phazi yosatsetsereka imatsimikizira malo omasuka komanso otetezeka a phazi kuti ligwire ntchito yonse.
Zogwirira zomwe zili m'thupi zimathandiza kuti chipangizocho chilowe mosavuta komanso kutuluka popanda kulepheretsa ntchito yonse ya wogwiritsa ntchito.
Mapazi achitsulo ndi okhazikika, amapereka kukhazikika kwa chinthucho ndipo amathandiza kuti chinthucho chisayende.