The golf club is held in the hands and feel from impact is felt first through the hands and is then sensed throughout the body. Good golfers are often described as having great ‘hands’ or a great ‘hand action’. this is misleading as it implies that the hands have a role in manipulating the club throughout the swing. While this is true in rare instances, most often the wrists are hinges between the arms and club and, as such, should be free and soft.  One thought you can have to keep your arms and wrists soft is to imagine your arms are simply two ropes hanging freely from your shoulders at address. The fingers will always have sufficient pressure to ensure the club doesn’t move in the fingers; however the wrists themselves should be quite soft. In order to keep the wrists soft, the arms must also have only very low levels of activation in the muscles.

The initial challenge in having soft wrists is that there is an immediate sense of lack of control.  A check I will make with students is when they are standing in the address position, I will lift their club off the ground slightly and then let go of the club. If the wrists and arms are soft, the club will
immediately fall to the ground (i.e. back to the address position). If there is too much tension in the arms or wrists, the club will remain in the air.

Maintaining this condition of the arms and wrists throughout the swing is crucial to achieving a well-sequenced movement with body, arms and club.

Source Peter Knight