How to Flex Pecs

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How do you contract certain muscle fibers when flexing the Pectoralis Muscle like this guy? I can flex mine, but not certain small groups of muscle fibers. : r/bodybuilding

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Bodybuilding Training & Diet Programs - How to Flex Pecs: . . In 2015, Gallup polls reported that 55.5 percent of all Americans exercised consistently every week, making for a seven-year high