If you look at the best ball strikers on tour and especially the longer hitters, you will find that they are very good at keeping the spine angle constant through impact.
Ice hockey players seem to be very good at this same thing both when playing hockey and when they play golf.
Keeping the spine angle in a consistent position throughout the swing helps with balance, swing path and plane along with angle of attack.
It is because of the similarities between the golf swing and the slap shot in hockey that we use this drill.
Having the hands split on the shaft really help to exaggerate the feeling of the right side extending down towards the ball while the left side is cleared backwards away from the ball.
Once you start to develop a feeling for these positions start to reduce the gap between the hands until you are back to a normal golf set up.
Try to exaggerate the feeling as you go, as what you feel you do and what you actually do are often different. You often need to feel like you move a mile to actually move an inch in the golfswing.
Get more videos here: http://wefixanyswing.com/videos/
Filmed at Troon.