energy foods

Photo: Thinkstock

1 of 6
All-Natural Performance Enhancers
You've been hearing it through the grapevine for years: Raisins, which are almost three-quarters sugar by weight, are a great way to perk up fast. And should you be running a corporate challenge or playing your company's rival softball team after work, those dried grapes have been found to boost athletic performance just as well as pricey sports chews.