effectiveness of cross-training on some skill full variablesfor Table Tennis Juniors Dr/Mohamed Ahmed Abd Allah Ibraham Dr/Dieaa Ahmed Talat Abd Allah The research aims to effectiveness of cross-training on some skill variables for Table Tennis Juniors under 15 years, The researchers used the experimental method due to its suitability to the nature of the research and its procedures through experimental design with two groups pre and post for each group, The researcher to choose the research sample way intentional, as the strength of core sample (24) junior, and use tests of Physical and skill as a means of data collection , and the most important results training program of cross-training showed positive effect on skill variables for Table Tennis Juniors under 15 years, and the most important recommendations the importanceapplicationtraining program of cross-training to development skill variablesunder consideration for Table Tennis Juniors under 15 years.