It’s true; in workouts and exercise we all get random adrenaline rushes that allow us to give max effort, even when the tank is empty. But what about taking pre-workout supplements, which promise to give you that extra boost? Do they really work, or is it more just the mental idea associated with it? And how much power does your mind actually have? A recent study shows just how much of physical fitness is mental. Read more about placebo ‘encouragement’ in exercise here.