Caffeine can have various effects on workout performance, including enhanced endurance, increased alertness, and improved reaction times. It stimulates the central nervous system, reducing the perception of effort and fatigue during physical activity. By mobilizing fat stores for energy, caffeine can increase exercise capacity and performance in endurance sports. However, sensitivity to caffeine can vary, and too much can lead to negative side effects such as jitteriness or disrupted sleep patterns. Timing and dosage are essential for maximizing caffeine’s potential benefits while minimizing adverse effects during workouts.