Set the elbow correctly at addressPoint the “eye of the elbow” upward when gripping the club, so the elbow stays in front of your body throughout the swing rather than drifting out to the side.
Use the bicep drill to feel the correct arm motionPress your bicep against your chest and lift the club with your forearm only — this trains the trail arm to pick up and drop correctly without any unnecessary manipulation.
Try the split-grip drill to check your downswing positionGripping the club with a split hand grip at the top helps you feel what it means to have the trail arm in front of your body as you come down into impact, rather than getting stuck behind.