Squegg’s ball device
Now, this is one of the simplest exercises for training the grip. Simply hang from the gymnastic ring or bar to build grip strength. If it is difficult to hang freely, you can put your feet on the ground for support and hold the bar to train the grip.
A word of caution: It is better to perform gym exercises for grip strengthening under the supervision of the gym instructor or a coach. The experts can give better guidance and their experience can help you perform the exercises in a better format.