Your GIF Guide To How Muscles Work

Published September 29, 2014
Updated September 9, 2014

How Muscles Work

Now that you know how they work, it’s time to actually use them. In 2011, the Centers for Disease Control found that barely 20% of Americans get recommended levels of exercise, and that over 25% of Americans don’t devote any time to physical activity. Meanwhile, obesity is increasingly becoming a national security issue.

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