Push the right elbow in from the top to shallow the club
From the top of the swing, Craig Hanson describes pushing the bottom of the trail elbow in so the right elbow moves a little closer. He says this gets the lead wrist into a more flexed position, which shallows the club, and that continuing to push the elbow in squeezes the elbows together and moves the right elbow more in front of the hip, stopping internal rotation.
Channel: CraigHansonGolf
Watch official source at 8:44