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篮球自发明到现在为止，罚球线到篮筐的距离一直未变，到现在都是14英尺，也就是4.23米。要完成这么远的飞跃扣篮，连乔丹这样的弹跳高手都需要长距离助跑才能完成。

但是，1956年3月，当时还在NCAA打球的张伯伦却促成了一项新规定：

“a chang would prevent a free throw shooter from stepping over the line until the ball hits the basket or backboard”。意思是说罚球者在球接触到篮筐或者篮板之前不可以越过罚球线。换句话说，我们平时比赛中可能出现的罚球起跳，落地时（此时球尚未及框）踩线都是违例的。而且官方规则说明上明确注释到，规则的变更是由于张伯伦的表现

（“Change primarily attributed to the dominance of Wilt Chamberlain”）NCAA在当年就通过了这项规定，而NBA则在1972-73赛季也引进了这条规则。

那么张伯伦当年究竟是什么动作，让联盟出台了这么一条针对他的规则呢？1956年的一份珍贵的报纸——《托莱多刀锋报》，11月28日的体育专版（第25页）上，作者详细地描述了张伯伦的违例又有威力的罚篮技巧：

“The big guy takes aim at the basket from several feet behind the line. Then he takes about three giant steps, leaves his feet before reaching the line, and stuffs the ball through the hoop. Under the old rule, it was perfectly legal as Wilt never touched the floor before letting go of the ball. In addition, his percentage was fantastic. ... now, a free throw must be made from within the semicircle. ...”大意就是，张伯伦从罚球线后退一段距离，然后助跑大概3步（Then he takes about three giant steps），在罚球线前起跳，把球塞进篮筐里。不过，在新规则下，张伯伦的这种动作就违例了。

除了这种助跑“罚球”外，该报纸还提到了另一种动作，“When Wilt Chamberlain was in high school, he had a unique way of shooting free-throws. He would stand at the top of the key, throw the ball up toward the basket, take two steps, jump toward the rim and jam the ball through the net. Doing this resulted in basketball rules to state that a player cannot cross the plane of the free-throw line when shooting a free-throw.”这种描述是说张伯伦在高中时独创的一种罚球动作，他可在罚球时把球往天上随便一抛，然后2大步跨进去（take two steps,），完成空接扣篮。这种自抛自扣显然也是符合当时的篮球规定的，同样也是被新规定所禁止的。

综上所述，张伯伦并不能原地起跳罚球线扣篮，他也是需要助跑的，持球助跑大概3步可以罚球线扣篮。自抛自扣大概需要助跑2步