Turning of Your Shoulders on the Backswing
My father used to be a very good player. He won lots of amateur tournaments when I was a kid.
I still remember the things he taught me when I was in elementary school. One thing he taught me was about turning of my shoulders.
He told me to face my back toward the target at the top of my swing. I still use this tip today.
Tiger Woods uses same kind of swing thought as well.
He checks 2 things.
1. Make sure his back is facing target at the top
2. His left shoulder is under his chin at the top
You have to turn your shoulders enough for more distance. The correct turning of your shoulders will let you transfer your weight fully to the right side.
Slicers or golfers who struggle with longer clubs usually don't have enough shoulder turn.
To turn more
If you feel like you are not turning your shoulders enough. You can do two things.
1. Narrow your stance
Narrow your stance to turn more. Lots of long hitters on tour have wider stance. But unless you have very flexible body, you will be able to turn more with narrower stance.
2. Flare your right foot
Flaring your right foot at address will let you turn more on the backswing.
If you flare your left foot out a bit, it will help you prevent slice and push.