A doctoral dissertation at the College of Physical Education and Sports Sciences at Al-Qadisiyah University discusses (the effect of special exercises according to predicting the limits of the sports peak on some physical abilities and physiological variables and achieving a 400-meter advanced sprint) I discussed my doctoral thesis in the College of Physical Education and Sports Sciences (The effect of special exercises according to the prediction of peak sports limits on some physical abilities and physiological variables and the completion of the 400-meter advanced sprint) by the student (Ahmed Abdel-Sada Mezher) and under the supervision of Professor Dr. (Akram Hussein Jabr Al-Janabi) The thesis aims to identify: 1. Identifying the effect of special exercises on the physical and physiological variables and achievement of advanced 400-meter runners. 2. ⁠Predicting the limits of the sporting peak and achievement of advanced 400-meter racers according to some physical and physiological tests. The thesis concluded: 1. The limits of the sporting summit have the ability to predict the athletic achievement of advanced 400 meter runners according to specific physical fitness elements. 2. Special exercises have a positive impact on improving the level in terms of specific physical fitness elements (speed – speed endurance – strength endurance) for advanced 400 meter runners. The thesis recommended: 1. Conducting periodic tests and before an appropriate period of time for advanced 400 meter competitors to identify their levels, know their strengths and weaknesses in order to enhance them, and predict their achievements in accordance with that. 2. Predicting the athletic achievement of advanced 400 meter racers through the limits of the sporting peak and relying on it because it is an accurate method for doing so. 3. ⁠Conduct similar studies on different samples and categories for the effectiveness of 400-meter running.