The study aims to identify the most important bio-kinematic variables affecting the velocity of the swimmer's pushing off from the starting block, and the researcher used the descriptive method. The research sample included 12 swimmers from the National Bank Club in Alexandria. The performance of the swimmers was recorded and analyzed to extract the bio-kinematic variables, the significance of the horizontal velocity and the resultant velocity were determined using the statistical treatments at the flight off moment. The horizontal wheel reached its maximum acceleration rate at the horizontal level at the relative stillness moment, reaction from stillness moment and maximum flexion of the knee (front leg) moment, while the vertical wheel reached its maximum acceleration rate at the vertical level at the pushing off moment and the beginning of flight moment, the horizontal wheel greatly affected the wheel collected at the pushing off moment, the weakness in the ankle angle affecting the swimmer's pushing off velocity. The shoulder and elbow angle help guide the swimmer's body and adjust the path of the center of gravity during flight. The full extension of the hip joint increases the angular wheel and the quick and smooth entry into the water. The angular wheel increases at the beginning of flight for the elbow and wrist joints