Serve With More Power
What part of the ball do you hit when you hit your flat serve? Hit the ball in the middle to the top of the ball so that you can hit the ball square at contact point. If you think of the ball as the face of the clock, hit the ball where the hands connect on a clock. You must then turn your hand, which is also called pronate, or snap, or turn your forearm. Also try to reach up to hit the ball as the arm is straight.