The aim of the research was to identify the effect of the development of the muscular capacity in the performance of the skills of the two men for the forward movement and the successor on the throat horse for the gymnasts under 13 years. The researcher used the experimental method on a sample of (10) 13 years) and research tools: Physical tests - Evaluation of the level of technical performance of the skills in question on the horse-throat device - Proposed training program. Statistical methods used: arithmetical mean - standard deviation - median - torsion coefficient - simple correlation coefficient - T test - improvement rate%. The most important results are: 1. The proposed training program has a statistical effect at (0.05) on the muscular ability of the arms, trunk and legs, and the performance of the two-legged and two-legged calves on the throat horse for the gymnast under (13) years. 2 - the presence of improvement rates in the remote measurement of the tribal members of the basic research in the carrying capacity of muscle and the performance of the skills of the circuits of the two men of the two men and the successor on the throat horse ranged between (9.87% - 33.33%). The most important recommendations are: 1 - The use of the training program to develop the tolerance of muscle capacity because of its effectiveness in improving the performance of the skills of the circuits of the two men of the front and the successor on the horse of the throat of a gymnast under (13) years.