Features:Perfect for building upper body strengthThe 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 bodyThe is a portable exercise device that is great for home, office or travel use.Method of use：Two arms bending spring after the neck.Two arms forward and upward bending spring and then relax.Two arms to her chest bending spring and then straight slowly relax.Stand up two feet apart.your right elbow bent with his left hand bending spring and then left elbow bend with the right hand bending spring.Behind two arms to hold spring and then bending straight down gradually.Matters needing attention:Operating at a constant speed when using, should do.Below are for reference only, how to choose according to individual constitution and decide, please20kg(Lightweight),30kg(Strong),40kg(Professional),50kg(Strongest)
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