If you are struggling with your golf game (I am sure all of you are), read entire writings of this website.
It is my firm belief that modern teachings are mechanically correct, but physiologically incorrect.
That is why so many golfers suffer backache and other problems like neck and knee injuries.
Because human body is not built to twist spine like modern teachings preach.
At Harry Vardon, Bobby Jones Era,, no body had back problem nor any other discomfort because their motions are based on natural body movements. For example, walking(left leg and right arm forward at the same time), pounding down nails, hitting baseball, swinging tennis racket or using old time Grass Whip.
You might think they were short hitters. NO, they were hitting long and straight even though those inferior equipments at the time.
They improved their performances by utilizing human body's natural movements to create Centrifugal Force.