人在瘫着时，腰部毫无支撑，腰椎附近很多韧带和肌肉都在收紧来 hold 住重力对腰部的吸引。
同时，为了和靠背产生足够的摩擦力，肩颈也要承受巨大的压力。要是瘫到下图的程度，相当于往脖子上挂了一个杠铃[并不简单]
这些肌群劳累过度，就会引起疼痛。
别低头，皇冠会掉；少瘫着，脖子和腰会坏掉。
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