My Favorite .gif
Here is someone who is tracing a straight plane line. They are setting up for a rather straight shot and is swining on plane.
Now if instead of keeping their plane line going down their target line, if they rotated it to the right or the left they would be swinging to far to the right or to the left for that shot.
Make sense?
Hookers swing "too far to the right" or too inside-out and slicers swing "too far to the left" mainly due to their very outside/in type of swing.
Hope that helps