Ok – first let’s define supination. Supination is basically just describing the fact that your lead arm rotates during the swing from a palm down to a palm up position. This is important because hitting down on the ball requires some shaft lean. Shaft lean without a little supination typically means the club face is open. Try this – get into your impact position with the shaft leaning, and a flat lead wrist. Is the face open? If not, you’re doing just fine! Watch the video here to understand a bit more about how to properly hit down on the ball!