Correct golf club grip pressure is often one of the most overlooked factors when achieving maximum distance. If you grip your club too tightly, your muscles become firm, rigid and far less flexible. On the flip side, if your grip is too loose you sacrifice control of your club and decrease your ability to hit the right spot on the ball consistently.
Ensuring you have the correct grip pressure on your putter is just as important when putting as it is when swinging your club for a full shot. When putting it is all about the feel and you want to ensure you have as much feedback coming back from your putter to your hands as possible. It should be easier to achieve a light grip pressure while putting as you only need to rock the club back and forth, as opposed to swinging it around your body.