Many people cast the club from the top of the back swing. By casting we mean releasing the angle from the right arm and club shaft too early.
To stop this you need to create lag and this drill helps people to learn the feeling for what lag is in the golf swing.
Using a medium iron (7-iron is good) wrap a towel around the club shaft and hold it in your left hand while holding the club in the right.
We are trying to stop the right hand flicking the club out early, so the towel is used to hold back the club shaft and keep the angle between the shaft and right arm.
Make slow swings to get the feeling, then try to recreate those feelings without the towel.
Once you learn to stop casting and get some lag into your swing you’ll find yourself hitting much longer drives and crisper iron shots.
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Filmed at Troon.