Abstract:The sports training process undertakes the harmonious development of the physical elements from all aspects (physiological and psychological) to suit the level of the physical structure with an emphasis on the development of the physical elements. Water activities differ from the rest of the other activities as they take advantage of the water medium in performance, however the characteristics that must be available in swimming are similar to those required by many other activities, swimming is similar to running and generally includes short, medium and long-distance competitions. The aim of the training process in the field of swimming is to help the swimmer to adapt to other training duties entrusted to him, which help him in reaching the best achievement according to his capabilities and aptitudes.And the digital achievements that swimmers achieve in all swimming activities did not come suddenly, but rather as a result of good plans proven on modern scientific foundations as well as correct planning and programming of the training curriculum vocabulary.The importance of the research is evident in the number of special exercises according to the critical speed to develop the endurance of speed and achievement for 200m free swimmers and to identify the extent of their impact on developing the research variables under study.As for the research problem, it lies in the lack of use of the training method that targets the energy system according to the principle of critical speed and the determination of the time period of the critical speed using fewer distances and high stresses (high) when determining the time period for the critical speed to develop the endurance of speed and achievement for swimmers (200 m) freestyle.And that the goal of the research is to prepare special exercises according to the critical speed to develop the endurance of speed and achievement for swimmers (200 m) free, as well as to identify the effect of special exercises according to the critical speed to develop the research variables under study for the members of the research sample. As for the research hypotheses, there are statistically significant differences between the pretest and the post test for the individuals of the research sample and in favor of the post test. The critical velocity is the maximum velocity that can be maintained continuously without fatigue below the lactic threshold.Research methodology and field procedure: