Caffeine can have a notable effect on exercise performance, primarily due to its role as a stimulant. It increases alertness, reduces perceived effort, and can enhance endurance during prolonged physical activity. Caffeine may also improve metabolic efficiency, allowing for better utilization of fat stores as fuel. Studies show that consuming caffeine before exercise can lead to improved performance in endurance sports and high-intensity workouts. However, individuals should consider their personal tolerance levels to avoid potential side effects such as jitters or disrupted sleep.