Why walking improves blood supply to the lower extremities. Compare the structure of the artery, vein, capillary

Why walking improves blood supply to the lower extremities. Compare the structure of the artery, vein, capillary. Prove the relationship of their structure with the function

In a walking person, venous blood from the lower body returns to the heart faster than in a person who is standing still. The load on the heart is reduced even with leisurely walking.
Arteries are vessels that carry blood from the heart. The largest of them is the aorta. In the arteries, blood flows under high pressure, so they have thick and elastic walls.
Veins are vessels that carry blood to the heart. Blood flows through the veins more slowly than through the arteries, their walls are soft and thin.
Capillaries are the smallest blood vessels, 50 times thinner than a human hair. They pervade all human organs. All capillaries gather in veins.

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