The research aimed to study the effect of Cross training on some special abilities (physical and physiological) and some of the performance determinants for train to train swimmers, whose ages range from (12-14) years, and the researcher used the experimental approach for a sample of 32 swimmers who were divided into two experimental groups of (16 swimmers) and a control ( 16) Swimming, and from the research tools: anthropometric measurements - physical measurements - physiological measurements - measurements of performance variables, and the researcher used the SPSS statistical program in order to obtain: the arithmetic mean - the median - the standard deviation - the simple correlation - the torsion coefficient - T-test, and from The most important results: There are statistically significant differences in the variables under investigation between the experimental and control groups and in favor of the experimental, which confirms the positive effect of Cross Training on swimmers in the education stage for training, and the researcher recommends: the need to use Cross training effectively during training programs for swimmers, especially the young age stages because of its Positive impact on the physical, physiological, skill and psychological aspects. Keywors: Cross training, Train to Train.