Fusion Pro Series Back Extension ili ndi mapangidwe oyenda ndi odzigudubuza kumbuyo, zomwe zimalola wochita masewera olimbitsa thupi kuti asankhe momasuka maulendo angapo. Nthawi yomweyo, Fusion Pro Series imakonzekeretsa pivot point ya mkono woyenda kuti ilumikizane ndi gulu lalikulu la zida, kuwongolera kukhazikika komanso kukhazikika.