Caffeine can enhance athletic performance by increasing focus and reaction time. It acts as a central nervous system stimulant, reducing the perception of effort during exercise. As a result, athletes may experience improved endurance, allowing them to perform at higher intensities for more extended periods. Caffeine also aids in the mobilization of fatty acids from fat tissue, providing an additional energy source during prolonged activities. However, individual tolerance levels vary, and excessive intake can lead to negative side effects, such as nervousness or insomnia.