It's never accessed. simply put we've never had the ability to tap into that potential and we've never really needed it. Your brain restrains you from going to your absolute max potential due to the hazard of destroying yourself on accident. Like you see people lift cars and do all this out of the ordinary things but that's only temporary. You get that boost of energy from a need/want so badly that you would die for. So in turn you force your body into using your potential temporarily.