A somewhat different approach to answering this question:
Humans need to move frequently. We need to be able to stretch out to our fullest and also roll into a ball/curl up. If we stay extremely still or cannot move enough for too long, we start to cause damage to our bodies.
Also, if we cannot stretch out properly we can damage our bodies. One form of torture involves putting someone in a cage that doesn’t allow them to completely stretch out. Just two weeks confined like this can cause permanent damage. This was used on Fulan Gung (however it’s spelt) practitioners to terrible effect, it you feel like looking into it further.
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