Your legs act as a "second heart"
Returning blood to the heart from lower parts of the body, such as the feet and legs, is hard work for your circulation because the blood has to be pushed ‘uphill’. To do this, the circulation needs help from muscles that surround the veins. When we walk, muscles in the feet and legs help to pump blood upwards. The more the muscles work the greater the squeezing action and the easier it is to push blood back to the heart. In effect, muscles in areas such as the feet and legs work as your "second heart".