The proper hip rotation will help you increase your distance.

If you take a look at today's professional tour players' backswings, you will see a minimum of hip movement.

The right knee (left knee for left-handers) stays fairly quiet as you take the clubhead away from the ball.

This quiet knee will allow you to keep your right hip from over rotating and will allow your weight transfer to stay on the inside of your right foot and leg.

This quiet knee will also help you turn your upper body behind the ball without swaying or letting your weight get on the outside of your right foot.

This coiled position you will be in at the top of your backswing will allow you to start your downswing by rotating the left hip and left leg out of the way and allow you to reach your maximum clubhead speed at impact and achieve more distance.

This is how PGA professionals such as Phil Mickelson and Tiger Woods hit their drives more than 300 yards consistently.