Improve your serve by varying direction, length, and effect (primarily slice), adjusting power strategically, mastering slice technique, utilizing the maximum legal height, ensuring a high first serve percentage, and connecting the serve proactively with movement to the net for the first volley.
This covers a lot of ground on the serve which is often overlooked. The coach breaks down the fundamentals like direction, length, and effects. What's particularly useful is the discussion on varying your serve and connecting it to your first volley, something crucial as you improve. They even touch on the psychological aspect of getting your first serve in.