I've watched this video with Martin Borgmeir a few times and it's interesting to see his philosophy on hitting drives.
Moving your feet before the swing and applying then right pressure seems really important not just for hitting it longer but also for hitting it straight.
From this point in the video he had some good advice. Basically it boils down to:
- Apply pressure on the left foot as trigger
- Apply pressure on the right foot in backswing
- Apply pressure on left foot in the downswing