When passing the ball in volleyball, the thumb can't touch the ball and the strength can't be exerted.

When passing volleyball, you should pay attention to the palm of your hand, the thumbs of your hands are opposite, the left and right index fingers are in a figure of eight, and the distance between your hands is 2-5cm. If the palm of your hand is not open, it is easy for your thumb to touch the ball first, so naturally you can't exert yourself. The thumb is only an auxiliary function, and the force depends on the index finger and the middle finger. There are many pictures for reference when searching volleyball passer's hand shape online.