The human body is not built to be stationary. The human body is full of complex muscles, veins, tendons, arteries that all work together to keep you alive and keep your blood flowing.
As you’re walking, you’re increasing blood flow and oxygen levels. When you’re stationary, this still happens but at a much slower rate, the muscles and veins in your legs have to work much harder to push that blood back up to your heart, whereas when you’re moving, these areas increase in size and increase the force of the flow.
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