Quick energy sources, such as carbohydrates, play a vital role during intense exercise by providing readily accessible fuel. When activities demand rapid bursts of energy, the body relies on stored glycogen in muscles. Consuming simple carbohydrates before or during exercise can quickly replenish these energy stores, enhancing performance and maintaining endurance. Furthermore, these energy sources help prevent fatigue, allowing individuals to push through challenging workouts and maintain their workout intensity. This is essential for athletes and anyone engaging in high-demand physical activities to achieve optimal performance.