Your GIF Guide To How Muscles Work

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.

Savannah Cox
Savannah Cox is the Managing Editor of All That Is Interesting. She holds a Master's Degree in International Relations, and works as a reporter/producer for DNAinfo.
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