Another cause of slicing the ball in the golf swing is the term stay behind the ball. People forever have been told to stay behind the ball when they hit the ball and that is impossible.
Should You Stay Behind the Ball?
The more that you stay behind the ball the more you have to pull across the ball and the ball has to slice because of the angle of the open blade and across. The only way you can hit a ball solid and not slice the ball or curve the ball in either direction is that you do have to get behind the ball, but from behind the ball you move into the ball and through the ball. And this is all happening at 100 miles per hour.
Correct Way to Shift Your Weight
You can't get back, stay behind the ball, and then try to go through it without creating and angle and curving the ball. So the whole idea in golf is you get behind the ball and then you are moving from behind the ball into the ball, but it is going in a flowing 100 mile an hour motion, and that what makes you square the club and go down the line of flight.
Remember, don't ever try to stay behind the ball because all you can do is either create an angle across it with an open blade or across it and flip your hands and hit a duck hook. So the idea is to always move through the ball to the straight balanced finish.