Caffeine can significantly enhance exercise performance by acting as a stimulant that improves energy, focus, and endurance. It works by blocking adenosine receptors, reducing perceived effort and fatigue during workouts, which can result in increased exercise duration and intensity. Many athletes utilize caffeine as a performance enhancer, especially in endurance sports, where it has been shown to improve stamina and speed. However, the response to caffeine varies between individuals, and excessive consumption may lead to negative side effects such as anxiety and sleep disturbances. Therefore, moderation and personal tolerance should guide caffeine intake for optimal benefits.