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There are two types of veins in your legs: superficial veins and deep veins. Superficial veins are visible on the skin's surface, while deep veins are not.
Superficial veins appear whenever lifting heavy weights or during a period of intense strength training. The superficial vessels are responsible for carrying the blood from the tissues closer to the skin’s surface to the deep veins.
Learn more about the difference between superficial and deep veins at USA Vein Clinics.
https://www.usaveinclinics.com/blog/difference-between-superficial-and-deep-veins/
