Why use Mass Pump? Mass Pump pre-workout formula contains naturally sourced caffeine, as well as taurine, creatine and beta-alanine, which together can contribute to improved alertness, particularly when supplemented with intense resistance training. Mass Pump contains the BCAAs, which can contribute to muscle preservation and, also importantly, mixes well and tastes great. Who can benefit from a pre-workout supplement? Pre-workout drinks containing creatine can increase physical performance in successive bursts of high-intensity exercise. Caffeine contributes to mental performance, which can be particularly beneficial for people who struggle to get into the zone before workout sessions.