The human body is so remarkable ... help deliver blood throughout the body. “Exercise is good for your heart, lungs and all the circulation, including the veins,” Teng said.

Inside you, there is an amazing network of blood vessels, the tubes that carry blood all around your body ... the veins take away waste. Do you know how many roads there are in just one person?

Why can't it just have a rest ... because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and arteries are ...