Author(s): N Rama Chandra Rao and Dr. RVLN Ratnakara Rao

Abstract:
The jump serve is a peculiar kind of serve in Volley ball where the serving player increases power and serves at a height by jumping to hit the ball. The extra motion generated in a jump serve allows the server to put additional power on the ball and this can make the serve very difficult to handle for the receiving players. It has many similarities to the spike itself. The player strikes the ball with maximum force at the peak of his jump, and tries to place it so that the opposing player cannot receive it easily. It has been suggested that a successful spike is determined by three factors, which are likely similar to those of the jump serve: the position of the ball at impact, the speed of the ball after impact, and the direction movement of the ball after impact. Volleyball has developed into a highly competitive sport which requires a high level of physiological and psychological fitness. The game at a high level of competition requires quicker sudden movements and fast reaction. Plyometric is based upon the belief that a rapid lengthening of muscles just prior to the contraction will result in much stronger contraction. The added contraction strength is believed to be due to strength of muscle spindles involving the reflex and resulting in an increase frequency of motor unit discharge.

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