Objective of the research: The research aims to design a proposed training program to develop the muscular strength of the arms and legs for junior freestyle swimmers using the bilateral disability index. Research sample: 30 swimmers of the age group (14-15 years) from the Pioneer Club swimmers registered with the Egyptian Swimming Federation for the training season 2019-2020 AD. Research methodology: The researcher used the experimental method. Most important results: The training program under study contributed to improving the digital level of the 100m and 50m freestyle swimming, as well as to developing the muscular strength of the arms and legs, with higher rates of improvement than the traditional training program.