The research aims to develop a training program using cardio exercises for judo players under 17 years of age and to know its effect on periodic respiratory endurance, some variables of the flexibility of the airways of the lungs represented in (vital capacity - VO2) on a sample representing all players in Al Sharqiya Sports Club in Al Sharqiya Governorate in the phase Sunnis (15-17) years, and their number is (28) players, and they were chosen in a deliberate way. A random survey sample was drawn from among the This is to be used in exploratory experiments and to find scientific coefficients for the tests used in the research, and thus the basic research sample became composed of (18) players. Cardio exercises have a positive effect on improving the respiratory circulatory endurance, some variables of the elasticity of the airways of the lungs, the effectiveness of the skill performance (under research) of judokas.community members, numbering (10) players