If the vessels are not well found if they are encountered in a clinical infusion, a tourniquet can be used to obstruct the venous return, when the vessels usually appear to dilate and become clear. If these visible vessels are also not visible in life, active physical work or physical exercise is required. This condition allows the veins to gradually dilate and make them more visible by lowering blood lipids, reducing subcutaneous fat, and thinning the skin. The whole body, including heart and lung function, will also be significantly improved during active exercise, and the immunity of the body will be improved to keep the body in a healthy state.