The ruler drill that fixes 3 things at once

Here's how the ruler takes you from grip to alignment to impact in one connected sequence. Thumbs centered on the edge confirms a neutral grip. Then hold it up in front of your body and check that the leading edge is square to your spine. Bow down into your golf posture and confirm it's still square when you get there. Now you know your grip is neutral, your face is square, and your alignments match before you've swung anything. From there the tee goes in the ground and the real work starts. Get into your posture, rotate the sternum, and tap the tee out. Simple as that. Three checkpoints stacked on top of each other, and they all flow from one prop you already have at home.