Fixing a Flat Golf Swing Plane
Correct shoulder plane increases control and maximizes accuracy and distance.

Improving Your Golf Swing Plane

The Importance of Correct
Plane Shoulder
Single Plane Golf Swing

This video goes over every aspect of the single plane golf swing

A flashlight can be an inexpensive and effective golf swing plane aid.

Golf Digest shared a great way to check your swing position using a household flashlight.  The light allows you to check and adjust your position.  What a great way to improve your technique!