笔者在教学实践中发现,不少学生在预摆时双臂没有摆起,上体没有伸展开,髋部前后活动幅度小,一直处于膝关节和腰腹后,导致两腿屈伸时大小腿活动幅度小,下屈时夹角大,伸展时夹角小,致使双臂向下后摆时重心高,腿部没有形成很大的压力。臂上摆时重心低,身体没有充分伸展,没有做出抬头、挺胸和顶髋的动作,这一细节却影响了立定跳远成绩的提高。 I found in the teaching practice, many students did not swing their arms in the pre-swing, the upper body does not stretch open, small amplitude of the anteroposterior hips, has been in the knee and waist, leading to leg movements when the legs Amplitude, flexion angle, stretching angle is small, resulting in lower arm when the arms down the center of gravity, the legs did not form a lot of pressure. When the arm is placed on the lower center of gravity, the body does not fully stretch, did not make a rise, chest and top hip movements, this detail has affected the standing long jump results improved.