The research aims to investigate the effect of hypoxic training on blood lactate concentration (rest-exercise) and the performance level of 1500 m. runners. The researchers employed the experimental method using a single experimental group comprising six athletes from the 1500-meter running team of the Athletics National Team of University of Sadat City at (2023-2024). The research sample underwent physical training using a training mask (hypoxic training) as part of the training program for 12 weeks, with three training sessions per week, totaling 36 training sessions. Each session lasted 90 minutes. The results indicated that the training program using hypoxic training with a training mask positively affected the participants, showing statistically significant differences between pre- and post-measurements in favor of the post-measurements in blood lactate concentration (rest-exercise) and the performance level of 1500-meter runners. The researchers recommended the use of hypoxic training to improve blood lactate concentration (rest-exercise) and the performance level of 1500 m runners. scientific and technological fields is the result of modern scientific research and inventions across different areas that serve humanity.