Meet Your Muscles · Muscles
There is no such thing as a pushing muscle.
Here's the fact that reorganises everything you thought you knew: no muscle in your body can push. Not one. They pull, and that's the entire repertoire.
So how do you straighten your arm after bending it? A different muscle, on the other side, pulls the other way. Every movement you can reverse is really two muscles taking turns pulling — which is why they come in opposing pairs.
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