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创作立场声明：久坐人群应该爱惜自己的身体，买个适合自己的坐垫，可以让腰椎、臀部得到放松。我在帖子里谈了自己对于使用包裹性坐垫的一些认识，抛砖引玉，欢迎讨论。
因为工作常常需要坐着，一直想买个坐垫+腰靠。
一整天保持一种坐姿，确实是件辛苦的事。
因而我们用各种方式懒散，不到半个小时已经葛优瘫、二郎腿、葛优瘫+二郎腿。。。
随之而来的臀部扁平、弯腰驼背，都是因为长期维持不正确的坐姿导致的。
为什么会跷二郎腿，是因为臀部长时间集中一个区域受力，坐得不舒服，身体知道翘二郎腿可以换换受力点。
但毕竟，跷二郎腿只能解决一时的疲劳，不是最终解决方案——
我们为了放松一条腿，把重量更多地压在了另一半的屁股上。
臀部依然苦不堪言。
有没有更好的解决方案？——某天逛小米有品的时候，被已经是爆品的乐班护腰塑形坐垫种草了。
其实类似的护臀坐垫很多，
但这款还含有腰部的支撑点，算是个小小的创新吧。
新配盟物流很快，第二天就到货了。送货上门的是宅急送快递员。
箱子里只有一个坐垫。
坐垫套着很结实的一层塑料膜。
坐垫的正面真身。
从背面可以看到腰部脊柱处有个小凹陷。
从侧面看，弧度还挺美的。
底部是防滑脚。
防滑脚外层有布的包裹，不会划伤家具。
从上往下看，能更加清楚地看到中间的凸起点。
这个位置可以对腰部的脊椎产生轻微的按摩作用。
我想起了一个物理冷笑话——“牛顿站在平方米上，变成了帕斯卡。”
力作用于一定的面积，得到压强。压强越大，越不舒服。
和握鸡蛋是一个道理，力越分散，鸡蛋越不容易破。
类似地，我们坐在凳子上，身体与凳子的接触面来自于左右侧骨盆下方与凳子接触的那一点点。
久坐不仅不舒服，还会导致臀部中心凹陷。
而坐在美臀坐垫上，左右两侧的大腿（股骨）也参与了支撑↓
同样是身体的重量，股骨也参与到受力中，受力的区域扩大了，骨盆下方的压强自然减小了。
①明显感到不太想跷二郎腿。跷腿欲望不会那么强烈了。换做以前，坐下来之后第二件事就是找个更舒服的姿势。
事实上，如果跷二郎腿，股骨受力减小，坐骨感受到的压强反而更大，因此跷二郎腿反而不如正常坐着舒服。
②腰部有被那个小凸起顶着的感觉，这种轻微的刺激，有助于保持坐姿正直。往后靠的时候，感觉更加明显。
③包裹性好，能明显感到整个臀部在均匀受力。夏天长时间坐着有点热。
④这款坐垫最好的一点，在于它的两侧支撑是硬的。这样的好处在于支撑力量更强。如果是软的材质，虽然可能更加舒服，却做不到均匀支撑。
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