BRX by Force Factor is a simple, yet effective pre-workout. Nothing fancy about it, the label is clear cut and says it all. Increase endurance, build muscle, and boost energy, with this complete pre-workout. This pre-workout is designed to be nothing but effective. At only 4.2g per serving, this pre-workout is simple and compact with nothing added that you don’t need. You’re going to get exactly what the label says: an energy boost, a strength boost, and enhanced focus.