What happens to the driver after impact? If you intend on increasing speed, your arms will allow the club to re-hinge. If you prevent this, you increase tension, which slows down your swing.
Step 1: Create Width. Step 2: Push away - transfering force away from the direction of the swing - not up. Step 3: Re-hinge the club; this requires relaxation, which increases speed.
Now that we know where Impact Position is, let's train our swing from here. This will give you a strong sense of how to get to the ball.
For some reason, people think that they must turn their bodies in order to hit the ball. This body motion disrupts the spine angle and throws you off completely. Here's what your body wants.