Everyone is built differently. Some players will swing upright, others flat and others may have a loop showing two planes. The reality here is that none of that matters. What does matter however, is how the golf club moves through impact and how your body moves with that club to produce the golf swing.
There are two major components. One is how the club moves through impact. Two is how the body works to produce number one. Without both of these components working together properly, you will not make consistent contact with the ball.
The club needs to go through the ball stable with out flipping or releasing - to achieve this your body needs to do three things - 1. Move 2. Move left 3. Go up - The key factor of your body moving is that your head has to follow these rules as well. No more keeping your head down....if you do, you will not be able to move properly underneath it and your hands will inevitably flip.
Learning how the club is supposed to travel through impact and learning how the body is supposed to work through the swing can be challenging but fortunately, since the way the body is supposed to work is fundamentally natural - our body will conform just like when we learned to walk, swim or ride a bike.
- Dan Alton