Not really the explanation you want, but I have to point out that a healthy person should be able to stand or walk all day without having lower back pain.
There are many reasons people will experience lower back pain after a day of standing/walking–bad posture, weak muscles, unsupportive shoes, harsh terrain (i.e. concrete), excess body fat, etc.–but one major reason so many Americans have lower back pain is that they never stretch. Stretching at the end of the day (especially your legs) can be really effective at preventing/alleviating lower back pain.
This isn’t an inevitable law of nature. It’s a sign that there’s a physical problem that should be addressed.
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