闪腰 is because the muscles on back are not strong.

来源: Morning3evening4 于 2012-02-14 06:43:53 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (159 bytes)
回答: 万一闪了腰，不是亏大了？ 由 H&CMom 于 2012-02-13 20:03:43

That is what I learned from Physical Therapist. And with some excise designed to strengthen the muscles, I am almost 100% recovered from herniated disk.

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