Why is walking considered okay for exercise yet standing for too long is considered bad for your health?
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Our bodies rely on the skeletal muscles in our legs activating to move blood from the legs back to our heart. This is partly why the veins in our legs have valves — we squeeze blood up a bit at a time, the valves help keep it from descending down, and eventually it makes its way back to our core.
Sitting or standing too long without walking can lead to blood clots developing. Blood clots in your veins can travel to the lungs and block blood flow. When you hear about people suddenly dying after long plane rides, or after playing video games for a day straight without getting up to do more than use the bathroom, those are generally due to blood clots from venous blood not moving around.
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