“This would be like having the ping pong paddle going left-to-right across the back ... But there’s more than just one way to use the lead arm in the golf swing. Another way Durland says ...

The idea of the perfect golf swing has altered and evolved ... You might hear that you should maintain a straight left arm through your swing. It’s a generally accepted teaching method.

"Reach for the sky on the backswing") compare to internal swing thoughts (example: "Keep your left arm straight") 4. Along those lines, practicing in slow motion, or at half speed, is really valuable.