The impact of developing some special physical abilities using simultaneous training on the effectiveness of the offensive performance of young boxers in Sharkia Governorate ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ Assistant Professor Doctor/ Ehab abd lrman Ibrahim sayedahmed This research aimed to develop a proposed training program using simultaneous training and determine its effect on some physical variables and the effectiveness of the offensive performance of young boxers in Sharkia Governorate. The researcher used the experimental method, and the research sample was chosen intentionally from young boxers at the Hahia Sports Club in Sharkia Governorate. Their number reached (17) boxers, while the number of the basic research(10) sample was (. The researchers also used (10) boxers as an exploratory sample from Outside the basic research sample and from the same research community to calculate the scientific coefficients for the tests under study. Some devices and tools were used, and the basic research sample was subjected to the proposed training program for a period of (8) weeks for (3)training units per week. The extracted data were processed with appropriate statistical treatments, including (arithmetic mean, standard deviation, skewness coefficient, t-test to calculate the significance of differences, and the improvement percentage equation). Among the most important results were: that simultaneous training led to the improvement of physical variables (strength characterized by speed - motor speed - performance endurance - muscular endurance), and the effectiveness of the offensive performance of young boxers, members of the research sample, through designing a proposed training program using the simultaneous training method. The researcher recommended the need to pay attention to developing the physical abilities of boxers, and that synchronous training be an essential part of sports preparation programs for youth and adults, and the importance of synchronous training being linked to the nature of the sports activity practiced.