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1．起跨腿发力时机不当，起跨角度偏大起跨腿蹬伸的方向取决于蹬地角的大小，为了获得较大的水平速度，起跨角在68°左右为宜，一般不超过70°。要想控制好起跨角就要把握好发力时机，发力过早，起跨角度就会偏大，形成跳栏，其结果是延长了腾空时间，降低了水平速度。若发力过
1. Since the improper timing of cross-leg hair force, starting from a large angle between the cross-legging stretching direction depends on the size of the pedal angle, in order to obtain a larger horizontal speed, starting at about 68 ° from the span, usually not more than 70 °. If you want to control the starting angle, you have to grasp the timing of force development. If the force is too early, the angle will be too large to form a hurdling column. As a result, the space time will be lengthened and the horizontal speed will be reduced. If the hair force too