Introduction

Since volley ball was first played the spike has been an important component of the game. The objective of the volleyball spike is to receive the ball off the setter and return the ball over the net with great force. It is important to the game of volleyball because it is hard to return due to the force that it is hit to the defending team. The spike incorporates many biomechanical principles, these include vertical height, momentum, lever systems, Newton’s laws, forces, load and centre of gravity. If all these principles are present in a spike, it will more often then not be skilful and successful. The following report will analyse my spike with reference to biomechanics and their importance in the spike technique.

The volleyball spike can be divided into 3 phases, these are approach and take off, attack and recovery.

Analysis and evaluation

1. Approach and take off

The aim of the approach and take off phase is to transfer forward momentum into vertical momentum by taking multiple steps and pushing off with your two legs gaining maximum height and positioning the body for the attack phase. My technique in this phase was average as I gained some momentum and pushed off to a reasonable height, but not maximum. My body height was reasonably low which lowered my centre of gravity, causing the take off to be more powerful then one at a normal height. Unfortunately I only pushed off with one foot which limited my take off height. Whilst pushing off, my hip extended on the leg that was pushing off and my knee was also flexed, this was to get lower to the ground and cause more for an equal and opposite reaction (Newtons third law). My second, non jumping leg swings through after I have left the ground, it also has flexion of the knee as well as flexion of the hip. This helps with my momentum and vertical. My trunk stays upright to ensure that my centre of gravity stays inside my body and doesn’t throw me off balance. My arms also made an extension then flexion motion as I was taking off.

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I believe that although I didn’t reach maximum height, this phase of my spike was a success as the strengths outweigh the weaknesses and it sets me up for the attack phase.

        

2. Attack

The aim of the attack stage is to successfully hit the ball over the net with great force. This is achieved by the swinging through of the attacking arm which hits the ball with the palm of the hand. My technique in this phase was good although I didn’t get the ball over the net due to a lack of vertical height ...

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