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Exercise for Energy: What Really Works continued...

Heller also reminds us to drink plenty of water before, during, and after working out to help decrease workout-related fatigue.

"Dehydration is an important cause of fatigue, so to get the most energy out of every workout, be sure to stay hydrated," she says.

And finally, what if you're really just too tired to do anything at all? Experts say simply getting up out of your chair may be enough to get those mitochondria energy factories powered up -- and for you to feel some instant results.

Says Thayer: "Even if you think you're too tired to do anything, get up and walk around the room, and in a couple of minutes you're going to feel some energy that wasn't there before. And that may lead you to want to move even more."

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