Pre workout is a broad term for a variety of body-building supplements that weightlifters, body-builders, and athletes prefer to use to boost energy, endurance, and focus during their workout. This supplement is taken explicitly by gym-goers prior to their workout.  Pre workouts function as a booster and increase the blood flow into your muscles. How a pre workout affects your body depends on the ingredients it contains. Moreover, the pre workouts are available in capsule and powder forms. But most people prefer them to be powdered and mix them mil milk, water, or juice.