Weightlifters and many other athletes have to load an abundance of Carbohydrates into their digestive system before a maximum performance. This is commonly a big pasta or rice meal the night before a meet or a game. With the carbs pre-loaded in the intestines, the body can draw that energy as needed.
Sometimes if you work out to much that it can cause an injury and we don't want that to happen but also at the same time it can be good for you depending on the build you want