Grip Strength Trainer The perfect design of the grip strengthener increases range of motion during exercise. Handheld fitness equipment to strengthen fingers, forearms and wrists. The perfect gift for athletes and musicians. Adjustable Finger Strength Trainer: You can choose the appropriate level according to your grip strength. With the help of the finger grip strengthener, you can not only enhance the strength of the fingers, forearms and wrists, but also isolate and train the flexibility of each finger separately, convenient and practical.