Therefore the biomechanical principles that are required to achieve maximum speed and accuracy in a tennis serve are a good base of support which allows the athlete to be confident in the serving stance. Force summation is used in the wind-up phase of the serve to start producing momentum to hit the tennis ball with the most force that can be given. Newtons third law comes into effect when the ball is thrown up into the air and the player swings the racket twisting his truck and pulling his left arm down to equalise the force produced by both arms. For the force generation phase to produce a large amount of power newtons third law is once again used. When the player pushes off the ground and starts to gain momentum which helps produce the greatest
