Adjust the intensity knob: + sign increases the intensity and No. 1 decreases the intensity. Look at the intensity scale. Four length adjustment gears and anti-slip sponge, rotate the nuts on both sides outwardsThen move the sponge handle and tighten the nut The area where the bowl forcer comes into contact with the arm adopts a foam structure to effectively prevent slipping. Can withstand multiple stretches and is not easily deformedInstructions: Overhand grip: Hold the wrist strength instrument overhand (palm facing down), and hold the upper arm tightly at the side of the body. Curl the bowl lift upwards, lift it to the limit and then slowly lower it back down. During the movement, the anterior wall muscles remain in a tense state. Hold the wrist strengthener in reverse (palms facing down), place the front wall against your thighs, relax your wrists, and bend the wrist strengthener upwards until it can no longer be bent, and then relax and restore it. Product material: PP+steel wire+foaming Practice movements: overhand/underhand grip List: 1*Spring Wrist Tensioner