No doubt about it: Regardless of the time of year, we remain in a state of exhaustion. Look at some of your most promising employees: Do you remember a time when they were on fire, when they had fantastic ideas, contributed at staff meetings, and regularly went above and beyond the call of duty? And do they now simply appear to be going through the motions?

If you're a business leader scratching your head for ideas, there's good news. In this slideshow, Brady Wilson, author of "Beyond Engagement: A Brain-Based Approach That Blends the Engagement Managers Want with the Energy Employees Need," has identified five simple ways to reinvigorate employees — solutions that not only take up little time, but will energize the brain and body, leading to a higher-performing workforce.