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What is the average size of a relaxed bicep for a man?

What's the average size of a relaxed bicep on a man?

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Average "unflexed" bicep of an adult male is probably right around 13 inches relaxed.   This would be measured with the arm straight / relaxed.

It's hard to come up with an average bicep size, because all males are different in terms of height, weight, and body fat levels.

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