The head and lower body stay still for the length of the stroke. The through stroke follows a straight line, with a firm left wrist. This insures a smooth club head motion through the ball. To help control how fast the ball travels the putting stroke should be balanced - with the backswing equal in length to the follow through. Short putts will have a short backswing with a short follow through.
Longer putts have a longer backswing and a longer follow through.
You've finished this VidBook.