This drill is for your loss of posture. If you are a player who tends to stand up during your backswing, then you need to focus on the flex in your knees. At the address position, we should have some flex, specifically in our right knee (Right Handed Golfer), or trail knee. Now, what you want to do as you begin your takeaway is to focus on maintaining that flex as you turn. You should be able to rotate while sustaining the bend in your trail leg. At any point if you extend or straighten up, then usually you are going to lose your posture. So again, in this drill, all you should do is focus on maintaining the flex in your trail leg during your backswing and that will keep you in good posture.
Please be aware that it is very important to identify, with the Loss of Posture Swing Characteristic and all other Swing Characteristics, if the problem is Physical or Technical. The best way to do this is to get screened. Being TPI certified, we could evaluate you through a physical screen to determine if your body is the problem or if it is your technique. So please come visit us at the RedTail Landing Golf Academy! We would love to help you with your game!
Good luck and we hope to see you soon, Matt Truong