Arm Rod Spring Steel Exerciser Power Wrist Hand Gripper, Strengths Arm Rod Fitness Equipment Chest Expansion Device  Features: The role of throwing arm device, Methods is also known as grip strength.  It is used to exercise the arm muscles.Its main exercise muscles and chest auxiliary exercise wrist. Increase the muscle strength of upper limbs.including the pectoralis major shoulder elbow and wrist joints and other parts of the power. It can make the upper limb muscles and increase the arm strength.Improve the quality of the body. Perfect for building upper body strength.The is a portable exercise device that is great for home, office or travel use. Matters needing attention: Before use please check whether the methods implement the connection parts is firm, no loose phenomenon. Please Make sure you have enough power to use the 20KG or 30KG or 40KG Level. Before use, please carry arm device handle seat belt on your wrist. When using, should choose relatively spacious field exercise, lest hurt to sell. Operating at a constant speed when using, should do. Below are for reference only, how to choose according to individual constitution and decide:    66lb/30kg(Lightweight), 88lb/40kg(Strong), 110lb/50kg(Professional)
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