The present research aims at analyzing the influences which the various angles of the knee-joints have on the exertion of the leg pulling and breaking strengths. The subjects. The subjects were physically healthy 16 males and 16 females. For this purpose the muscle strength measuring instrument have been used to analyze the angles of the maximum leg pulling and breaking strengths, the order of the two strengths at various angles, and the difference between the right and left legs in the two strengths at various angles. The resulted obtained were as follows: 1. The leg isometric pulling strength was recorded hightest at 120˚ both in male and in female. 2. The leg isometric breaking strength was in both sexes recorded hightest at the angle at 120 degrees. 3. The pulling strength in terms of the size of the Knee-joint angle was of the order 120˚, 90˚, 60˚ both in male and in female. 4. The breaking strength in terms of the size of the knee-joint angle, in both sexes, was of the order of 120˚, 90˚, 60˚. 5. Each of the pulling and the breaking strengths of the right and left legs, in both sexes, had no significant difference in all the angle involved.