The research aims to study the effect of 10-20-30 training on developing critical speed, some physical and physiological variables, and the digital level of the 800-meter race, which was conducted on the second year students of the Faculty of Physical Education for Boys, Zagazig University The researchers used the experimental method by following the experimental design of the two groups, one experimental and the other controlling using The pre and post measurements for both groups. The research sample was chosen by the intentional method and included (20) students in the second year at the Faculty of Physical Education for Boys, Zagazig University The researchers also used (8) students from the same research community and outside the basic research sample to conduct the exploratory study and scientific transactions. The most important results were the presence of statistically significant differences and percentages of improvement between the two measurements before and after for the control and experimental groups in some physical and physiological variables in favor of the post measurement in some of the physical and physiological variables under study and this improvement is due to the training program followed.