Imagine this scenario. An amateur player takes a lesson from a coach with the hopes of hitting a forehand like Roger Federer.
Let’s say the coach plays along. He/she presents a sequence of images to the amateur in order to see exactly the various phases of Roger’s forehand. Next, the amateur performs shadow swings, going through each position as carefully as possible. The coach then feeds the amateur a few balls, providing feedback ONLY on how close the stroke looks to Roger’s.