Not taking the proper pre-workout formula of food and supplements is like trying to race your car down the street with no gas, you're not going to get anywhere. In fact, you may actually be doing more harm then good, as your body will begin to use the muscles you worked so hard to develop as the next-best energy source. So, after your pre-workout meal, but before your workout, get a boost in energy, strength and endurance from one of the many Pre-Workout formulas on the market. Supplements such as BioQuest's testosterone-charged AndroFury and MusclePharm's Assault include nitric oxide for increased pump, creatine monohydrate for building more muscle mass faster, caffeine for increased focus and energy, and the amino acid arginine for muscle growth, thanks to its vasodilating properties. Other formulas also contain such ingredients as phosphates, taurine, beta-alanine, B vitamins, L-glutamine, antioxidants, electrolytes and tyrosine, while some are most revered for what they don't contain: sugar, caffeine and fillers, such as high-glycemic maltodextrin or artificial dyes. For an explosive workout with gym-rattling muscle pumps and through-the-roof endurance, set the tone of your workout before you even set foot in the gym with these pre-workout products.