All great players have the ability to swing every club at a consistent tempo and with great balance. Rhythm and balance are linked. Some players, like Tom Watson, exhibit faster tempos.
Some, like Ernie Els, exhibit a slower tempo. Yet all remain balanced. The key to consistency is to maintain your balance and use a smooth rhythm.
If you rush your swing you will loose your balance and the end result is inconsistent contact and poor ball flight. Outstanding ball strikers are rarely off balance at impact and their rhythm is
the "glue" that bonds their positions and movements. Often their swings seem effortless and they, as Julius Boros described it, "swing easy and hit hard." Great rhythm allows you to properly sequence your body motion and arrive at impact in a position of leverage and power.

Ten-time PGA TOUR driving accuracy champion Calvin Peete says the three keys to straight driving are "Balance, Balance and Balance."
If you want to be a more consistent ball striker, you must understand how the body should be balanced in four key positions.

Setup
Although your spine is tilted away from the target at address, you should have your weight evenly balanced between your right and your left foot with your middle and long irons. Also, you should feel your weight evenly balanced between your heels and your toes, roughly on the balls of the feet.

Top of the Backswing
As you pivot to the top of the back swing, your weight moves into the inside of the back foot. You should feel approximately 75-percent of your weight on the back foot and 25-percent on the front foot. The weight must never move to the outside of the back foot.

Impact
By the time you arrive at impact, approximately 70- to 75-percent of your weight should be shifted onto the front foot. Your head must be behind the ball and your hips must shift forward approximately 4 inches past their starting position. This increases the spine tilt by at least double.

The Finish
At the completion of the follow through, you should have the majority of your weight - about 90-percent of it - on the outside of the front foot.

Source: Free Golf Tip Newsletter Number 14 of 52