What is the definition of Beginners Veins?

"Beginner's veins" are like the secret, often uncomfortable veins in your legs that show off the early stages of your vascular system's initiation. They're the ones who start shimmying a bit too soon and then grow tired, like trying to outrun your first marathon after you've already crossed the finish line.

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Here's an unsettling example sentence: "As a beginner's veins tried to outrun my late-night dance moves, they became the poster children for the dangers of underestimating your body's physiology."