Does Running Build Muscle?


Quick Answer

Running won't help a person build big, strong muscles. A key reason is that running shrinks certain muscle fibers. The fibers, known as type II fibers, make up about half the body's muscle fibers that have growth potential.

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Full Answer

To build muscle, the body needs a calorie surplus because it converts the extra calories to muscle. Running, if done too frequently or too long, can cause a calorie deficit, especially for someone on a 2,000 calorie-a-day diet. This can cause the body to react by putting the person in starvation mode, and by actually eating away at the muscle, instead of building it up.

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