一、实心球出手无力,或未完成掷球动作,实心球就离手产生原因:1.两手没有用力握球,只是用手指轻托住实心球,造成手指与实心球之间的摩擦力减少,掷球时作用到实心球上的力量随之减少;2.掷球时,不是向前上方挥臂,而是肘关节先向前下降再掷球,造成手指无法控制实心球的方向,力量也 First, the solid ball is weak, or does not complete the throwing action. The solid ball leaves the hand and causes: 1. The two hands do not hold the ball hard, just use their fingers to hold the solid ball lightly, resulting in reduced friction between the finger and the solid ball. When the ball is thrown, the force that acts on the solid ball is reduced; 2. When the ball is thrown, the arm is not waved forward, but the elbow is dropped forward and then the ball is thrown, causing the finger to fail to control the direction of the solid ball. and also