i am strong

From Ikai and Steinhaus, "Some Factors Modifying the Expression of Human Strength," Journal of Applied Physiology, 1961, we learn the following: "The maximal pull of forearm flexors was increased and, in some instances, decreased in predictable fashion by a loud noise, by the subject's own outcry, by certain pharmacologic agents (alcohol, adrenaline, and amphetamine), and by hypnosis. Significant average changes ranging from +26.5% to 31% were observed." The authors suggest that the normal human inability to exert oneself to one's physiological maximum is the result of "acquired inhibitions that in turn are subject to disinhibition by pure Pavlovian procedures, by anesthetization of inhibitory mechanisms, or by pharmacologically induced symptoms serving as stimuli for disinhibition." In other words, you're always capable of great feats; it just takes a crisis for you to actually perform them.