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創作立場聲明：久坐人群應該愛惜自己的身體，買個適合自己的坐墊，可以讓腰椎、臀部得到放鬆。我在帖子裡談了自己對於使用包裹性坐墊的一些認識，拋磚引玉，歡迎討論。
因為工作常常需要坐著，一直想買個坐墊+腰靠。
一整天保持一種坐姿，確實是件辛苦的事。
因而我們用各種方式懶散，不到半個小時已經葛優癱、二郎腿、葛優癱+二郎腿。。。
隨之而來的臀部扁平、彎腰駝背，都是因為長期維持不正確的坐姿導致的。
為什麼會蹺二郎腿，是因為臀部長時間集中一個區域受力，坐得不舒服，身體知道翹二郎腿可以換換受力點。
但畢竟，蹺二郎腿只能解決一時的疲勞，不是最終解決方案——
我們為了放鬆一條腿，把重量更多地壓在了另一半的屁股上。
臀部依然苦不堪言。
有沒有更好的解決方案？——某天逛小米有品的時候，被已經是爆品的樂班護腰塑形坐墊種草了。
其實類似的護臀坐墊很多，
但這款還含有腰部的支撐點，算是個小小的創新吧。
新配盟物流很快，第二天就到貨了。送貨上門的是宅急送快遞員。
箱子裡只有一個坐墊。
坐墊套著很結實的一層塑料膜。
坐墊的正面真身。
從背面可以看到腰部脊柱處有個小凹陷。
從側面看，弧度還挺美的。
底部是防滑腳。
防滑腳外層有布的包裹，不會劃傷傢俱。
從上往下看，能更加清楚地看到中間的凸起點。
這個位置可以對腰部的脊椎產生輕微的按摩作用。
我想起了一個物理冷笑話——“牛頓站在平方米上，變成了帕斯卡。”
力作用於一定的面積，得到壓強。壓強越大，越不舒服。
和握雞蛋是一個道理，力越分散，雞蛋越不容易破。
類似地，我們坐在凳子上，身體與凳子的接觸面來自於左右側骨盆下方與凳子接觸的那一點點。
久坐不僅不舒服，還會導致臀部中心凹陷。
而坐在美臀坐墊上，左右兩側的大腿（股骨）也參與了支撐↓
同樣是身體的重量，股骨也參與到受力中，受力的區域擴大了，骨盆下方的壓強自然減小了。
①明顯感到不太想蹺二郎腿。蹺腿慾望不會那麼強烈了。換做以前，坐下來之後第二件事就是找個更舒服的姿勢。
事實上，如果蹺二郎腿，股骨受力減小，坐骨感受到的壓強反而更大，因此蹺二郎腿反而不如正常坐著舒服。
②腰部有被那個小凸起頂著的感覺，這種輕微的刺激，有助於保持坐姿正直。往後靠的時候，感覺更加明顯。
③包裹性好，能明顯感到整個臀部在均勻受力。夏天長時間坐著有點熱。
④這款坐墊最好的一點，在於它的兩側支撐是硬的。這樣的好處在於支撐力量更強。如果是軟的材質，雖然可能更加舒服，卻做不到均勻支撐。
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