FF Series Back Extension yokhazikika komanso yosavuta kugwiritsa ntchito imapatsa ogwiritsa ntchito maziko olimba ophunzitsira mphamvu. Mapadi osinthika a m'chiuno ndi zogwirira ntchito zokhazikika zimapatsa ogwiritsa ntchito chitonthozo chowonjezereka komanso kulola kuti ntchito ziwonjezeke.
Zosavuta zophatikizira m'chiuno zapawiri zimakhala ndi zokometsera zowonjezera komanso mawonekedwe a ergonomic kuti zitsimikizire kugwira ntchito ndi chitonthozo.
Zodzigudubuza zokhuthala kwambiri komanso nsanja yayikulu yopanda skid imatsimikizira kuyika kwa phazi momasuka, kokhazikika komwe kumalola kugwira ntchito kwathunthu.
Zogwirizira zokhala ndi ma anatomiki zimalola kulowa ndikutuluka mosavuta kwa zida popanda kulepheretsa kugwiritsa ntchito kwathunthu.
Mapazi achitsulo ndi okhazikika, amapereka kukhazikika kwazinthu ndikuthandizira kupewa kusuntha kwazinthu.