By training your grip, you will cause an increase in grip strength, especially if you do grip exercises often. This is because your grip is something that can and should be trained every day. Whenever you are in a gym, or whenever you are having a sports day, you can always train your grip so that you will have an improved grip strength.
Squeeze the Bar One of the most powerful tools you can use to improve your grip strength is a bar. You can gain a lot of improvements in grip strength if you squeeze the bar with your hands during a set. However, it is advised to avoid letting the bar slide towards your fingers. You should keep it locked in the palm of your hand by wrapping your thumb around the bar to hold it there and squeeze it as hard as possible.