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The study aimed to: - Detecting the significance of the statistical differences in lactate level in blood and performance in the 400-meter sprint between the pre and post tests after using the method of (speed escalation and distance stabilization) According to a Computerized Running Training programs for interval training . - Detecting the significance of the statistical differences in lactate level in blood and performance in the 400-meter sprint between the pre and post tests after using the method of (distance escalation and speed stabilization) According to a Computerized Running Training programs for interval training . - Recognize the significance of the statistical differences in lactate level in blood and performance in a 400-meter sprint between the two methods (speed escalation and distance stabilization) and (distance escalation and speed stabilization) According to a Computerized Running Training programs for interval training in the post-test . The researchers used the experimental approach for its convenience to the study nature, and the research experiment was carried out on a sample of short distance runners (junior category) at the Specialized School of Athletics in Nineveh Governorate for the sports season (2019-2020) and they were (12) runners, and this sample was divided into two experimental groups through using the randomization method with (6) runners for each group, The first depends on interval training in the method of (speed escalation and distance stabilization) and the second depends on interval training in the method of (distance escalation and speed stabilization) by relying on a programmed system for the sprint in interval training . The researchers reached the following conclusions: - Interval training in the method of (speed escalation and distance stabilization) and Interval training in the method of (distance escalation and speed stabilization) made positive progress in lactate level in blood and performance in the 400-meter sprint . - Despite the positive effect of interval training in the two methods (speed escalation and distance stabilization) and (distance escalation and speed stabilization) there was a relative superiority of interval training in the method of (speed escalation and distance stabilization) in the special endurance consisting of (speed endurance and strength endurance) and performance in Sprint 400 meters . The researchers recommended a set of recommendations, the most important of which are : - The use of interval training in the method of (speed escalation and distance stabilization) and not being satisfied with the use of interval training in the method (distance escalating and speed stabilization) when training a 400-meter sprint because of its importance in developing the performance in the 400-meter sprint, as well as its creation For functional adaptation in relation to blood lactate level after improvement in performance. - measuring the level of lactate in the blood in the training of runners from time to time, as a functional indicator that helps in detecting the level of training status and identifying the adaptation and recovery of runners, in order to evaluate the training process. - The possibility of relying on the Computerized Running Training programs for interval training in designing interval training methods and curricula for all short-distance runners, including 400-meter sprinting for all levels and age groups .

The study aimed to: - Detecting the significance of the statistical differences in the special endurance (speed endurance and strength endurance) and performance in the 400-meter sprint between the pre and post-tests after using the method of (speed escalation and distance stabilization), According to a Computerized Running Training programs for interval training . - Detecting the significance of the statistical differences in the special endurance (speed endurance and strength endurance) and performance in the 400-meter sprint between the pre and post-tests after using the method of (distance escalation and speed stabilization) According to a Computerized Running Training programs for interval training. - Recognize the significance of the statistical differences in the special endurance (speed endurance and strength endurance) and performance in a 400-meter sprint between the two methods (speed escalation and distance stabilization) and (distance escalation and speed stabilization) According to a Computerized Running Training programs for interval training in the post-test . The researchers used the experimental approach for its convenience to the study nature, and the research experiment was carried out on a sample of short distance runners (junior category) at the Specialized School of Athletics in Nineveh Governorate for the sports season (2019-2020) and they were (12) runners, and this sample was divided into two experimental groups of During the randomization method with (6) runners for each group, The first depends on interval training in the method of (speed escalation and distance stabilization) and the second depends on interval training in the method of (distance escalation and speed stabilization) by relying on a programmed system for the sprint in interval training , based on score tables , as well as speed tables that are based on score tables that include determining the times that the runner must travel the sprint distance in and which are set on the basis of percentages or The measured stresses with the number of repetitions and the duration of the intermittent rest . The researchers reached the following conclusions: - Interval training in the method of (speed escalation and distance stabilization) and Interval training in the method of (distance escalation and speed stabilization) made positive progress in special endurance consisting of (speed endurance and strength endurance) and performance in the 400-meter sprint . - Despite the positive effect of interval training in the two methods (speed escalation and distance stabilization) and (distance escalation and speed stabilization) there was a relative superiority of interval training in the method of (speed escalation and distance stabilization) in the special endurance consisting of (speed endurance and strength endurance) and performance in Sprint 400 meters . The researchers recommended a set of recommendations, the most important of which are : - Using of interval training in the method of (speed escalation and distance stabilization) and not being satisfied with the use of interval training in the method (distance escalating and speed stabilization) when training a 400-meter sprint because of its importance in developing the special endurance consisting of (speed and strength endurance) and performance in the 400-meter sprint . - Possibility of relying on the Computerized Running Training programs for interval training in designing interval training methods and curricula for all short-distance runners, including 400-meter sprinting for all levels and age groups .

ABSTRACT The impact of using special exercises to develop static balance on the balance beam. 1- The impact of using special exercises to develop dynamic balance on the balance beam. 2- The impact of using special exercises to develop the level of skill performance on the balance beam. 3- The significance of statistical differences between the two posttests for both the experimental and control groups in the characteristics of static and dynamic balance on the balance beam for females. 4- The significance of statistical differences between the two posttests for both the experimental and control groups in the characteristics of the level of skill performance on the balance beam for females. The researches used the experimental method appropriate with the nature of the study on a sample of 2nd grade female students in the college of education for girls . The sample consisted of ( 20 ) females divided into an experimental and a control group each with (10) female student . The method of the study included a pretest for balance and level of skill performance followed by the training course during an (8) week period using (3) training units per week and a fluctuation load (3:1). The posttest was carried out in the same procedure of the pretest . Conclusions and recommendations : Conclusions: 1- The training course for static and dynamic balance exercises achieved a significant development in all the tests concerning unstable balance and balance on the instep , walking o the beam , forward rolling on the beam for the experimental group . 2- Overcome the training course for static and dynamic balance exercise, when comparing between the tow post tests for both experimental and control groups in benefit for post test of experi- mental groups. Recommendations : 1- Adopting various exercises for the balance characteristic as it is affective in developing both static and dynamic balance . 2- Emphasize on using repetitive training by the trainers as it is affective in developing both static and dynamic balance.