That's correct. Evolution takes hundreds of years to have complex beings like us adapt to new environments. We still have back-pains which is a heritage from more than 1 000 000 y ago when our ancestors would walk on four.
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Impressive and true this fact about the back pain and also impressive that so many people are not aware about the routes of such a common problem.
That´s an interesting "fun" fact. I didn´t know about it...