The aim of this research was to identify the effect of the training program to develop the strength of the muscles of the center on bone mineral density and some physiological, physical and skill variables of squash players. The researcher used: Presentation of the experimental design that was designed by an example of pre and post measurement one group, and the research sample included (20) players who were divided into (12) players who were divided into (12) players as a basic sample (8) an exploratory sample from outside the sample sample and from the same research community. The data was extracted using the appropriate statistical treatments including (mean, standard deviation, torsional coefficient, Pearson correlation coefficient, T 'Test, improvement ratios). the results: The ptraining program using the center's muscle strength exercises led to an improvement in the concentration of the hormone calcitonin and calcium in the blood and the density and content of the lumbar bones in the spine and thigh bones among the subjects of the sample under study. And the proposed training program using center muscle strength exercises led to improving the physical variables (the ability of the lower abdominal muscles, the capacity of the lower back muscles, the ability of the muscles of the two sides, the static balance, the motor balance) among the subjects of the sample in question. To improve my front and back side strokes for the sample in question.