Back Extension: Tube size 50x100mm, uye 3mm ukobvu, yakasimba kwazvo uye yakagadzikana, Professional gym inoshandisa dhizaini. Panguva yekugadzira, inogadzirwa neStandard 3-layer pendi. Standard 3mm ukobvu chubhu. yakanyanya kugadzikana uye yakasimba yekusimba muchina. Zvinotora iwe kunzwa kutsva kwekudzidziswa panguva yekurovedza muviri.