Sink the head and open the chest to stop going left
Craig Hanson describes a drill of sinking the head down while opening the chest at the same time, keeping the head looking to the side. He references the tour average of about two to four inches of head lowering, and says sinking down keeps the right arm more bent and under, which helps produce shaft lean, steepens the shoulder plane, and keeps the heel of the club up.
Channel: CraigHansonGolf
Watch official source at 2:24Why this context matters
Hanson notes he may hit it a little heavy while grooving this feel.