Drinking coffee before an early workout may improve your overall performance. Since caffeine is a stimulant, it may help your body function more efficiently. “‘Caffeine is a stimulant that acts on the central nervous system, the heart, and possibly the ‘center’ that controls blood pressure,’ all of which play a vital role in helping your mind and body push harder in a workout… Plus, researchers found that when people caffeinated before a workout, they ate 72 fewer calories later in the day and had an easier time keeping cravings in check.” The researchers advised that people who work out in the morning supplement their coffee with water to help them stay hydrated. Additionally, people who exercise at night should not drink coffee near bed time, even if it is before a workout.