In the Build a Better Backswing Series, Part 2 is all about the turning pieces of the knees and how they flex to enable movement. Using Gears 3D technology in the first video, we are able to take a look at several different angles to see how the knees move.
Great knee action paves the way for the hips and shoulders in the backswing, which you can find more about in video one here.
In the below video, I lay out knee action from a professional golfer that I like to see.