If you don't know what Pre Workout is, it is an energy supplement and it has a lot of caffeine in it and is meant to give you extra energy levels. I wouldn't recommend it as your body is just going to be in overdrive, and it is going to make you feel very uncomfortable. It has a place in the fitness industry but not indoor cycling, in my opinion. If you are trying to gain muscle with indoor cycling, make sure read my nutrition instructions.