…is having the proper balance between having the club head stay on the arc and move left after impact, without the shaft and/or angle of attack being steep.
In other words, you see golfers who swing the club left, but they are steep and you see golfers who are shallow, but the club swings too far right. What you see few of is golfers who are shallow and the club moves left after impact.
That is the secret. Get the club to move left after impact, but coming in shallow and with a shallow shaft angle.
So in turn, the secret is learning how to shallow the club in transition.
The way to set that up is to not be too inside on the backswing.
This sounds technical, but it is not. When you pull the butt of the club to the ball…steep. That’s your over the top, shank, early extension…etc.
When you transition properly and the right elbow leads and drops in front of the right hip, that shallows the shaft and forces the body to rotate.
In other words, steeping the shaft forces the body to do bad things to hit the ball, while shallowing the shaft forces the body to rotate.