Just because having some chocolate may help boost your running performance doesn’t mean you should feel free to chomp or guzzle it down. Chocolate is packed with sugar, and many Americans have more than is recommended.hen subjects ate the chocolate bars, they also showed other indicators — such as a lower rate of perceived exertion and favorable blood lactate levels — which showed researchers that having a chocolate bar before exercise can help boost exercise stamina and improve recovery. You Might Also Like.