WASHINGTON - Flex your arm. You already know which muscle you're showing off. The biceps are among the most recognizable muscles in the human body, but they share the upper arm with a less-celebrated ...

The Best—and Worst—Exercises for Tricep Gains, According to a Trainer originally appeared on Men's Fitness. The triceps brachii is a three-headed muscle that plays a critical role in elbow extension, ...

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