Abstract The research aims to investigate the effect of specific skill physical exercise on LDH enzyme stimulation and the level of achievement in 100m freestyle swimming for applicants. The research was conducted on a sample of the Army Sports Club, whose number was (8). The exploratory experiment was conducted on swimmers from the main research sample and after providing all the necessary supplies and needs to carry out the research, the two researchers, in cooperation with the team coach, proceeded to conduct the pre-test, which included drawing a sample of blood intravenously from the hand by (3 cc) and testing 100 meters of free swimming, after which the trainer applied the program's vocabulary The training prepared by the researchers, and after the completion of its application, the post-test was conducted, the data were collected and treated statistically. The two researchers concluded that the quality of the skillful physical exercises had a clear effect on the improvement of the LDH enzyme and also on the development of the level of achievement of the research sample. The researchers recommended the need to be careful in choosing the exercises and training method Which suit the athletes' ages, levels, and the training goal for which it was set.