Photo: Owen Price/istock

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Running on Empty:
An intense morning at work has your brain saying "I quit!" by noon.

Power Up:
Get outside. Research shows that being outdoors, no matter how briefly, makes us feel more alive. Nature's effect is so strong that even imagining yourself in the wild can pep you up, says Richard M. Ryan, PhD, who has studied nature and mood with his colleagues at the University of Rochester in New York. "The key is to immerse yourself in the moment, whether you're imagining it or you're really outside," he says. "It won't work if you're on your phone or ruminating about something. Paying attention to the scenery—the bird on the tree or the sunset—seems to be a big part of why we're more relaxed in nature." (Even, apparently, when it's all in our head!)