Your ancestors had to move to survive, thus your body evolved to be in motion.
For instance, you wouldn’t recognize it but our human calf muscles in the lower leg are massive (compared to four-legged animals) *because* they also act as pumps to help the heart bring blood way back up to where the heart is. If you don’t walk around some, your heart isn’t getting the natural assistance it evolved to expect from walking around and hunting.
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