Exercise is good for you—in ways that go far beyond weight control and muscle building. Scientists are finding that the bodies of people who stay active throughout their lives improve all the way down to the insides of their cells. For example, active people’s mitochondria—the energy-producing power plants within each cell—become highly efficient at burning fatty fuel, even when that person is at rest. This doesn’t mean you have to run marathons—just 30 minutes of moderate activity nearly every day will do the trick.
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