The research aims to identify the effect of body weight exercises of stability and free fall in the development of some muscles of the lower extremity of the triple jump players for the sample under research, as well as the percentages of the contribution of electrical activity for some working muscles while performing some exercises for the sample under research The researcher used the experimental method, using the experimental design for one experimental group and conducting a pre- and post-measurement, and the descriptive approach (case study). The research community included the jump players in Prussia Egypt Sports Club on the tenth of Ramadan, and the research sample was chosen in a deliberate way from the research community, and their number was (17) players. To (3) players as a poll sample, and (12) players as a basic sample. The most important results were that the exercises used in the proposed program led to an increase in the percentages of improvement in the level of physical abilities and the level of skill and digital performance of the triple jump for the sample in question, and the muscles of the lower limb recorded different responses, which were the highest rates of contribution to motor performance according to the analysis of the electrical activity of the rectus femoris muscles. (right) and biceps femoris (right), while the twins muscle (left) and the tibialis anterior (left) had the lowest percentages of contribution to performance The researcher recommended to be guided by the results that have been reached, as attention to them during training leads to raising the performance level of the triple jump players, as well as the use of electromyography (EMG) to determine the state of the muscles of the triple jump players and their development through minute details that are difficult to notice with the naked eye, and using the results of Electromyography (EMG) in preparing training programs.