I have a good idea of what is happening. You may start off in a given position but on the downswing at impact you're moving towards the target or lifting or both. My guess is you're pushing / sliding the hips towards the target, its the most common problem. If you were lifting to cause a 6" forward movement, you'd probably miss impact by miles.

To move the 6-inches forward only takes an inch or 2 movement in the body. To prove the point: from your shoulder to the clubhead is probably in the region of 70 inches. Think of your shoulder as the middle of a clock with your arms and club as one of the hands on the clock. To tick 6 seconds, the outside of the hand moves some distance but the inside doesn't move at all.

Do it - hold the club parallel to your shoulder. Move the clubhead a few inches right and see how much you shoulder has moved. Its hardly moved, correct?

In otherwords the distance travelled by the club towards the target is many times that of the body moving towards the target.

To sort out the problem is easier than understanding why it happens. Here is a drill that you can use:

Get an umbrella, a golf shaft or something you can push into the ground and the end is just above hip height, let's say its a shaft. Address the ball with the shaft an inch outside the left foot. Swing back normally and hold the position.

Your next move isn't to the taget ... it's actually left of target. During the backswing your left hip has moved right of the target, now it has to go back towards the left. So, turn your hip to the left without touching the shaft. Let the rest of your body follow bring the club inside the line towards impact.

Keep your spine angle (the lean of the torso) the same until after impact, when your right side has caught up and your torso rises, turns and faces the target. From the address position until after impact your torso lean has remain the same.

Ok? Try it and if you need any more help, post again.

__________________
Golf is easy ... once you know how.
Graham Arnott, teaching professional
Kelrosa Golf Studios
www.kelrosagolf.com
Class 'A' PGA Member
Full Member: World Golf Teachers Federation (GB&I)