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Pronation and the wrist snap don't happen like a lot of players think. At contact, you actually want a stable arm and wrist so that you can transfer as much energy into the ball as possible, and the way you develop that is with a technique called "The Shot-Put Serve"...
So in this video, Dr. Mark Kovacs, one of the world's leading experts on tennis biomechanics (how the body should be moving when you hit a serve, forehand, and backhand) explains why pronation and the wrist snap don't happen like many players think...
And then teaches you the "Shot-Put Serve" with a simple progression of drills so that you can serve much, much faster.