This research aimed to design a proposed training program using simultaneous training inputs to develop anaerobic and physical efficiency and performance variables for the 400-meter race The researchers used the experimental method because it is appropriate for the type and nature of this research through the experimental design using the pre- and post-measurements for one experimental group. The researchers selected the research sample intentionally from the players of the Zagazig University Athletics Team for the academic year (2023 /2024). The number of members of the research sample was (7) players for the 400-meter race, in addition to (5) players for the exploratory experiment from the same research community but outside the sample. The extracted data were processed using appropriate statistical methods, including the arithmetic mean, standard deviation, median, skewness coefficient, Mann-Whitney test, Wilcoxon test, simple correlation coefficient (Pearson), and improvement rates The most important results were: the simultaneous training inputs in the program had a positive impact with statistically significant differences on the specific physical variables (transitional speed - speed endurance - general muscular endurance of the leg muscles - leg muscle strength - leg muscular capacity) among the research sample members, and the development of anaerobic efficiency had a positive impact with statistically significant differences on some functional variables among the research sample members. The proposed training program led to an improvement in the 400m race time in general and an improvement in the running speed in the race sections in particular, as the higher the step frequency, the shorter the step length and vice versa