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Our muscles power us -- from the tissue that pumps blood from our heart to the tiny fibers that give us goosebumps. How exactly do muscles work — and how can we best strengthen them?
By WBUR4.3
36643,664 ratings
Our muscles power us -- from the tissue that pumps blood from our heart to the tiny fibers that give us goosebumps. How exactly do muscles work — and how can we best strengthen them?

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