Weak finger grip may be caused by many factors, such as lack of exercise, hand injury, nervous system problems and so on. Here are some ways to exercise your finger grip:

1. Grip ball: Grip ball is a kind of equipment specially used to exercise finger grip. You can buy some different strength grips at home or in the gym and practice every day.

2. Finger flexion and extension: put the palm of your hand up on the table, then bend your fingers down as far as possible, keep them for a few seconds, and then try to straighten them up. Repeat this action 10- 15 times, and then change the other hand.

3. Finger-pinching exercise: Pinch two coins or other small items between your fingers, and then try to hold them with your fingers. Exercise 10- 15 times each time, and do it many times a day.

4. Plastic bottle practice: put some coins or other small items in an empty plastic bottle, then hold the bottle with your hands and try to catch the coins with your fingers. Exercise 10- 15 times each time, and do it many times a day.

In addition, you can also improve your finger grip through other sports, such as playing table tennis, boxing and jogging. If the finger grip strength is too weak to affect daily life, it is recommended to find a doctor for examination and treatment.