I would of thought biology would like us to be symmetrical for maximum comfort. But after sitting down for some time humans tend to put one leg over the other? Is there a biological reason for this?
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Sitting in chairs is not very natural or good for our bodies. Our natural sitting style is [actually a squat](https://katrinaprotopapas.files.wordpress.com/2014/11/man-squatting.jpg).
Children do this naturally as they are quite flexible. As we age, and sit in our chairs and get too fat, we lose a lot of our flexibility and can no longer sit in our natural way.
When we sit in chairs, we constantly have to adjust ourselves to be comfortable to sit in this unnatural way.
I stand at my computer most of the day. Why is does it become uncomfortable standing after a while. Even if I do shuffles in place for circulation?
First, remember that chairs are an inventiion only a few hundred years old. For most of human history people hunkerd, knelt, squatted, or crouched, or lay down.
In my case, and according to both a book I have read and some of my medical textbooks, it’s because most chairs hurt peoples’ lower backs, or take a lot of postural effort to prevent hurting the lower back.
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