What could be simpler than working on your biceps and doing an arm workout? Whether you’re a guy or a girl, just grab a couple of dumbbells and do as many biceps curls as you can, right? Not exactly. Most biceps exercises focus on just one arm movement that the biceps are responsible for: Flexing at the elbow. As shown in the picture below, a straight arm (in a position known as “elbow extension”) allows the biceps to lengthen and relax. The biceps muscles aren’t doing any work while your arm is in this position. Then the biceps muscles fire as the elbow …
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from Tumblr http://vincentpennington.tumblr.com/post/141088214374
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