Features ● There are three resistances in one jelly expander, and it will perform different resistance by holding the different hole. ● The inner hole of the tubing is heavy resistance, and the outer of the tubing is light resistance. ● It's suitable for people training from light resistance to heavy resistance. ● 両端に大きな球狀のゲりップがあつて、捆みやすく屈伸運動やエキスパンダーとしても使えます ● 球狀部分を握って握力運動にも使えます
