Stick an alignment rod in the ground (or use your bag) brushing the outside of your trail hip. Make backswings turning without pushing the rod: the hip rotates, it doesn't slide. Then hit balls at 70% without touching the post.
Face-on: the trail hip slides laterally outside the trail foot during the backswing instead of rotating; the head travels several centimeters to the right.
Frequently asked questions
What is the "The hip post" drill for?
Swap the sway for pure rotation
How do you do the "The hip post" drill?
Stick an alignment rod in the ground (or use your bag) brushing the outside of your trail hip. Make backswings turning without pushing the rod: the hip rotates, it doesn't slide. Then hit balls at 70% without touching the post.
How long does the "The hip post" drill take?
About 15 minutes per session, 15 reps.
Sources
Titleist Performance Institute — Body-Swing Connection screening