The objects of research are 10 excellent springboard diving male athletes from the national team.The paper makes kinetic analysis on their run-up in the same motion.The result shows that the buffer of stride-jump step is the active buffer.It is separated from the brake and plate-pressing.In this way,athletes can ease the tension caused by the function type of the muscle.The long stride step can help isolate the buffer.The high horizontal momentum after the run-up can ensure the horizontal buffer.And the length reservation of the step and the horizon speed are important factors of completing the active buffer
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