(Department of Physical Education,Shandong Architectural Engineering College,Jinan 250014,China) Abstract: In the dash running the ahead driving leg action not only keeps balance the dynamic body but also save the power of the after driving leg. So the quality of the ahead driving leg is very important in the dash.People must recognize the leg's active estate that add;the breadth and force of the leg's active in front of the body in the training because it will administer to shorten time of the ahead driving leg reduce impact power of the after driving leg. Key words: dash; running; the ahead driving leg; impact power |