Muscles.

We have over 600 of them.

They make up between 1/3 and 1/2 of our body weight,

and along with connective tissue,

they bind us together, hold us up, and help us move.

And whether or not body

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You're lifting weights.

The first time feels easy,

but each lift takes more and more effort until you can’t continue.

Inside your arms,

the muscles responsible for the lifting have become unable to c

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They’ve caused global scandals.

They’re banned in most athletic competitions.

But are steroids actually bad for you?

The term “steroids” refers to a broad category of molecules

that share a similar

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