A good pre workout supplement will help increase the intensity and effectiveness of your training session. It will do this by increasing your energy, focus, power and strength levels. Pre workout supplements are used from everyone from bodybuilders to runners. Over the past few years we’ve seen pre workout supplements become very popular amongst people doing any types of training. Most pre trainers contain creatine, caffeine and arginine to help improve your level of training. Pre trainers should be taken around 30 minutes before training.