Advanced player looking to add more width on their backswing and improve their left arm position should try this neat little drill from Vijay and put a headcover under their right arm
Place a shaft just outside your target line and slightly behind your shoulder to practice your swing plane, this will help you keep your takeaway on plane and also stop you from coming over the top on the downswing
Establish a cleansing breath as close to putting your club in motion as possible