Balance

If you focus on using your pre-shot routine, your rhythm, swinging in balance, and being efficient, you will improve your swing. You should not do anything with your swing that will negatively affect your balance. When you are off balance during the swing, the chance of making solid contact is very low, if not impossible. George Knudson, one of the best ball strikers on the PGA tour in the 1960’s and 1970’s, said “Never do anything at the expense of balance”. Most golfers rarely focus on a balanced swing. Their focus is on hitting the ball. The better golfers swing in balance. This is one of the biggest differences between a consistent ball striker and an inconsistent ball striker.
Balance should come from bottom up. You must feel that the bottom of your feet and your ankles support your body. When you coil in the back swing, the bottom of the right foot and a firm right ankle must support the coiling of the upper body. When you start the down swing, you must feel the bottom of the left foot and a firm left ankle support the transition from the finish of the back swing to the start of the down swing.
Work to make your rhythm and balance to be your primary focus. This means you will always use your rhythm to swing in balance. Once the rhythm and balance are consistent, the task of achieving efficient build up and release of energy is straight forward. Being efficient is not easy because the moves are counter intuitive. But if you are using your rhythm and are balanced, the feel of the efficient swing will be easier to learn.