Caffeine can enhance exercise performance by stimulating the central nervous system, leading to increased alertness and reduced perception of exertion. As a stimulant, it may boost endurance, allowing athletes to push through fatigue during prolonged activities. Research suggests that caffeine can improve athletic performance by enhancing strength, power output, and overall exercise capacity. However, individual tolerance varies, and excessive intake may lead to side effects like jitters or increased heart rate. It's essential for athletes to experiment with caffeine under professional guidance to determine optimal usage.