The relationship of a number of bio-kinematic variables of the striking arm for the main phase with the accuracy of serving from the right side for squash players

The study aims to identify the values of several bio-kinematic variables of the striking arm in the semi-high serve of the squash game and to understand the relationship between these variables and accuracy. The study problem lies in understanding the good mechanism for performing the semi-high serve skill in squash by recognizing the bio-kinematic variables that affect the technical performance accuracy of the skill to achieve high skill performance. The purpose of the semi-high serve skill is highlighted.The researchers used a descriptive method suitable for the nature of the research. The study population consisted of the national team players, totaling five who were deliberately selected as the study sample. The researchers utilized scientific observation and video recording using three cameras: two (Casio) and one (JVC). The first Casio camera was placed beside the player at a distance of 4.47 meters and a height of 1.35 meters from the ground to extract the coordinates for each player on the (Y, X) axes at a recording speed of 480 frames per second. The second Casio camera was positioned in front of the player at a distance of 5.88 meters and a height of 1.35 meters, also recording at 480 frames per second, to obtain the coordinates for each player on the (Z) axis. The JVC camera was used to obtain player coordinates in case any part of the body movement was not covered by one of the cameras and to assist in illustrating the movement for drawing purposes. The recordings took place in the squash halls of the Faculty of Physical Education and Sports Sciences at the University of Baghdad.The researchers employed statistical means, including the arithmetic mean, standard deviation, and (T) test.The researchers concluded the following:There is a significant correlation between the displacement of the wrist's center of mass in the main phase on the axes (path, R, X) with the accuracy of the semi-high serve.Emphasis on the importance of the wrist during performance stages, especially the main phase, being the most crucial.Focus on the displacement of the back and front swings and the correct kinetic transfer of the body and arm, ensuring proper kinetic flow during the semi-high serve in squash