The Fusion Series (Standard) Back Extension e na le moralo oa ho tsamaea o nang le li-rollers tse ka morao tse feto-fetohang, tse lumellang motho ea ikoetlisang ho khetha ka bolokolohi mefuta e mengata ea ho sisinyeha. Thepa e atolositsoeng ea thekeng e fana ka tšehetso e phutholohileng le e babatsehang ho pholletsa le mefuta eohle ea ho sisinyeha. Sesebelisoa sohle se boetse se rua melemo ea Fusion Series (Standard), molao-motheo o bonolo oa lever, boiphihlelo bo botle ba lipapali.