In the past I have said that tennis balls are best used for training crushing grip. I am not sure if this is true, anymore, because I have found a very useful way to train them for pinch grip as well. Normally, when you use a tennis ball to train your grip you hold the ball like you normally would and squeeze it with your full hand. This technique, however, does not allow you to train your thumb, but rather only your four fingers.
If you want to train your pinch grip with a tennis ball all you have to do is adjust the ball in your hand so it is no longer resting in your palm, but rather it is held between your thumb and any finger(s) you choose. The exercise is performed the same way as the crushing grip variation. You are still squeezing the life out of the ball for reps or time, but you are including the thumb in every rep.
It is difficult to work all four fingers simultaneously with the thumb using this technique, but instead it is better used to isolate one finger and the thumb at the same time. Just make sure to work each finger equally.
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