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via Lifehacker http://ift.tt/1P5RgV6

Dear Lifehacker, I’ve heard that I should be “mixing it up” and changing up my workouts at the gym. My friend, who’s a bodybuilder, told me that this is called “muscle confusion” and will force them to grow. I only know a few exercises at the gym so changing it up seems even more difficult. What do I do?

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