RELIANCER Adjustable Hydraulic Power Twister Arm Exerciser

Spring back is violent, easy to hurt you The spring in the middle will easily pinch yourself The resistance strength will weaken over time The exercise effect will be greatly reduced because your arm can't fully open when you use the spring power twister. A totally-Enclosed hydraulic cylinder that offers you stable resistance, the opening angle of the arms and motion tracking will change if you adjust the resistance, so you don't need to change arm movements what your muscles are already used to.