الفهرس 
قائمة المحتوياتيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
This study aimed at designing a multi-stroke device and its effect on some technical performances of junior tennis, by identifying the effect of training using a multi-stroke device on some technical performances (The serve- Ground strokes: forehand and backhand - Volleys: Forehand volley & backhand (For junior tennis, and the experimental method was used, and the research sample was chosen by the deliberate method from the junior of Mansoura Sports Stadium for the stage of (14:12) years, whose number is (16) young men and registered in the Egyptian Tennis Federation, They were divided into two groups, one experimental and the other controlling, where training was applied using a multi-stroke device on the experimental research sample through a special training program for tennis and during the special preparation period for a period of (8) weeks with (4) training units every week, and after completion of The application of exercises using a multi-stroke device. Dimensional measurements were made to identify the effect of using a multi-stroke device on some of the technical performances of young tennis players, and the results showed that the use of the multi-stroke device in the training applied to the experimental group and the traditional training applied to the control group had a positive and significant effect. On the accuracy of some artistic performances of the tennis junior, The members of the experimental group (training using a multi-stroke device) outperformed the members of the control group (traditional training) in the accuracy of some technical performances of the junior tennis team, as the application of the use of the multi-stroke device achieved the highest results and was more effective in the rates of improvement in the accuracy of some technical performances (The serve- Ground strokes: forehand and backhand - Volleys: Forehand volley & backhand ( and some special physical abilities of the tennis junior and with a greater degree than the traditional training, which indicates the effectiveness of the multi-stroke device in training for junior tennis, and the most important recommendations were the use of a multi-device Strikes when developing some of the technical performances of the junior tennis player, due to the effectiveness of the device in improving the level of performance.