Ntau cov khoom siv qoj ib ce koj yuav muaj fiberglass.Piv txwv li, cov hlua hluav taws xob hlais, Felix sticks, grips, thiab txawm tias cov phom fascia siv los so cov leeg, uas nrov heev hauv tsev tsis ntev los no, kuj muaj iav fibers.Cov khoom siv loj, treadmills, rowing machine, elliptical machine....
Nyeem ntxiv