Right Arm Drill for more Power
If you want to increase your distance, you might want to try right arm drill.
Here is how to do it.
1) Put your left hand on your waist
2) Grip 9-iron with your right hand only
3) Take 20 practice swings
By swinging with your right hand only, you will feel the weight of the clubhead. In golf swing, I think it's very important to feel the weight of the clubhead during the swing.
So this drill will teach you about that.
Also, you will learn how to use your right arm during the swing.
After taking 20 practice swings, hit some ball with your right hand.
You don't have to hit it far. Just focus on hitting it in the middle of the clubface.
After you get used to it, start trying to hit the ball to the left or right of the target. You will learn more about your swing path using this drill.