Many golfers ‘muscle’ the ball. That’s when they swing the club with force… as if the ball had done something terrible to the golfer. The golfer then has this long lever, moving at forceful fast speeds, and he possibly will over rotate bringing the club too far behind his back causing an arch in the back. This is extreme and unnecessary because the ball has already been hit.
Some golfers concentrate so terribly hard on hitting the ball perfectly that they do that, and then they don’t carry through the ball with consistent force or direction. The club could go anywhere after that… as well as the ball.
Neither are good for your score. Imagine your body is a stiff towel rolled into a cylinder. The entire cylinder rotates back for backswing, but the top half moves about twice as far as the bottom half. Therefore, it is twisted around itself.
For forward swing, the towel rotates forward and the twist untwists itself. It isn’t finished until it goes in the opposite direction. Your body can do this in a consistent speed. No need to force anything. At the top of backswing, there is a brief moment where the special brains (interneurons) in the spinal cord fire automatically and create a speedy forceful contraction to the muscles around the spine. No need to think about killing the ball. Keep your stroke steady through the ball. After you have hit the ball, there will be a deceleration that occurs when the club is parallel to the ground.
Maintaining your speed and plain of your cylinder from start through impact will give you a smooth follow through and finish.