Sliding the hips forward too early and before impact causes the lower body to get ahead of the upper body resulting in an open clubface at impact. Rotate and clear your hip back toward the heel of your lead foot without sliding them too far forward toward your target. Also remember to rotate your arms and forearms through impact. For right handed players, think of hitting a line drive to left field instead of right field (vice versa for lefties).
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What causes a golfer to 'block' their drive? What's a good drill to help correct this issue?
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