The research aims to design a training program using the maximum physical effort and to know its effect on some physiological variables and the concentration of rare salts in the blood under study for junior swimming under 14 years old. The research sample, using the intentional method, consisted of young swimming under 14 years old from the Pioneers Club in the tenth of Ramadan city in Sharkia Governorate, and their number reached (18) young people. The researcher used physiological measurements as a means of collecting data. The most important recommendations were the application of the training program using the maximum physical effort in the development of physiological variables and the concentration of rare blood salts in the blood under research for swimming beginners under 14 years.