The purpose of this study was to determine the optimal time to take caffeine I order to maximize muscular strength and muscular endurance. There have been many studies done that have shown that caffeine has the ability to improve both muscular strength and endurance due to many different effects that it has in the central nervous system. However, there is still a very intriguing question: when is the optimal time to take caffeine in order to maximize performance? It is known that caffeine has its peak effects occur about 45 minutes after ingestion. By taking caffeine 45 minutes before exercise, the peak effects would occur at the beginning of the workout, and by taking it 15 minutes before the exercise, the peak effects would occur in the middle of the workout, when the body is becoming fatigue. This study is aimed to figure out which of these scenarios is the most effective.