Caffeine can enhance workout performance by improving focus, increasing endurance, and reducing perceived effort during exercise. It stimulates the central nervous system, leading to increased alertness and quicker reactions. Additionally, caffeine can help in mobilizing fat for energy, which is particularly beneficial during aerobic workouts. However, individual responses to caffeine vary, with some experiencing side effects like increased heart rate or jitters. For optimal benefits, it's important to consume caffeine strategically, ideally about 30-60 minutes before exercising.