There are a number of moves that cause golfers to leak power during the swing, including an exaggerated swaying motion.

This happens when the (right-handed) golfer shifts too much weight to the right side on the backswing. Typically, the head and shoulders will move well to the right of the ball. Part of the golfer's weight will shift to the outside of the right foot, causing the knee to bend slightly outward.

Often, the swaying golfer will leave too much weight on the right side during the downswing, resulting in weak, right-veering shots. Or, he'll sway back to the left, causing a multitude of mishits.

Sway – Golf Lessons & Tips

How Limiting Golf Backswing Sway Can Increase Power
Stop your Backswing Sway for More Power – Senior Golf Tip
Stop Your Golf Backswing Sway For More Power – Senior Golf Tip
Turn The Left Shoulder Under The Chin To Stop Sway – Senior Golf Tip
Fixes To Help Stop Golf Backswing Sway

Limit Backswing Sway to Increase Power
Other Sources Of Power With A No Sway Golf Backswing
Signs Of Golf Backswing Sway
Turn Don't Sway In Your Golf Backswing
Cut Down On Your Golf Backswing Sway for More Power
Hold Onto The Right Knee Position To Stop Golf Backswing Sway
Break The Habit Of Swaying In The Golf Swing

Right Hand Golf Tip: How to Reduce Backswing Sway to Help Boost Power

Cut Down On Your Golf Backswing Sway for More Power
Golf Sway, Should Body Move Sideways During Back Swing?